Remove: DOS support

In 10 years there was no active development on DOS. Although it
turned out to still work, the FPS was very bad. There is little
interest in the current community to look into this.

Further more, we like to switch to c++11 functions for threads,
which are not implemented by DJGPP, the only current compiler
for DOS.

Additionally, DOS is the only platform which does not support
networking. It is the reason we have tons of #ifdefs to support
disabling networking.

By removing DOS support, we can both use c++11 functions for threads,
and remove all the code related to disabling network. Sadly, this
means we have to see DOS go.

Of course, if you feel up for the task, simply revert this commit,
and implement stub c++11 functions for threads and stub functions
for networking. We are more than happy to accept such Pull Request.

Fix: don't include xaudio2 if you are not going to compile it

This is more in trend with other files, where if the driver is not
selected, we don't even attempt to compile it.

Remove: libtimidity support (NOT timidity support)

libtimidity was introduced with the support for PSP. PSP has been
dropped almost a year ago, but this music driver was not. This
corrects that oversight.

timidity (via extmidi) still works fine. This purely removes the
libtimidity support, which was only really available for PSP.

Remove: BeOS support (deprecated by Haiku)

In 10 years there is no commit to change how BeOS works, and we
have no active maintainer for it. It is unlikely it works in its
current state (but not impossible).

With the arrival of SDL2 (and removal of SDL), BeOS is no longer
support. SDL2 suggests to use Haiku instead of BeOS.

Remove: MorphOS / AmigaOS support

In 10 years there is no commit to change how MorphOS works, and we
have no active maintainer for it. It is unlikely it works in its
current state (but not impossible).

With the arrival of SDL2 (and removal of SDL), MorphOS is no longer
support. There is an SDL2 port for MorphOS, but it is not maintained
by upstream SDL2, and nobody can currently test it out.

If anyone wants to re-add MorphOS, please do (revert this patch,
fix the problems, and create a Pull Request). If you need any help
doing so, let us know! It is not that we don't like MorphOS, it is
that we don't have anyone fixing the problems :(

(svn r20490) -Change: merge the extra GRF sources so updating them becomes a bit easier.
The (prebuilt) grf will still remain, so if you don't have NFORenum and GRFCodec it will still work.

(svn r16318) -Change: use !! instead of @@ in src/*.in too.
-Change: use @ instead of ~ in configure/Makefiles so Debian's build system(s) can also build RC binaries.

(svn r11853) -Fix [r11837]: [OSX] reconfigure killed the space in shared-dir
Thanks to TrueLight for finding the solution to this one
Note: if the shared-dir setting is already broken due to this then you have to manually run configure again

(svn r8757) -Add: added libtimidity music driver (it is a nice small library simular to timidity via extmidi)
[PSP] -Add: added PSP specific code for libtimidity. libtimidity code is based on the work of Turulo. Tnx a bunch!

(svn r8628) [PSP] -Add: added configure support for the PlayStation Portable target
In the coming days/weeks there will be an attempt to port OpenTTD for
this target. This is a very small step towards that.

(svn r8605) -Codechange: [OSX] changed all objective C to objective C++
This will permanently solve the issue where compilation on OSX broke because C++ code was added to some header files

-Note: (important if you develop mac specific code)
taken from http://developer.apple.com/releasenotes/Cocoa/Objective-C++.html
gdb lacks an integrated C++ with Objective-C parser. This means that gdb won't be able to evaluate expressions that contain both C++ and Objective-C constructs.
gdb assumes that the language for ".mm" files is C++.
you can change it to objective C by typing: (gdb) set language objc
Mixing C++ and objective C has some limitation (see link for all of them)

(svn r8304) [WinCE] -Add: added configure detection for WinCE.
Compiling doesn't work, neither does running, but it is a first step in developing an official WinCE port

(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make.
- Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
- A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
- Proper support for OSX universal binaries.
- Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
- Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.

(svn r5426) - Makefile: Make the configure script work properly for setting target compilers; Set CC_TARGET / CXX_TARGET
up the same way as CC_HOST / CXX_HOST, and add or fix their options within the configure script. In the
Makefile, instead of overriding CC / CXX with the target compilers if they are set, set the target compilers
with the default compilers if none are set (bit of a mouthful), and use the target compilers explicitly.

(svn r3873) -Fix: don't remove Makefile.config if it isn't there in the first place
-Add: allow --debug=3 to enable DEBUG lvl 3 (--debug results in a lvl 1)

(svn r3866) -Fix: only add CXX if it is given
Word of warning: configure _does_ delete your Makefile.config!

(svn r3865) -Add: a fully optional configure script, that is a wrapper around
Makefile.config, inserting data directly into it. This is needed for the
CompileFarm (nightly) and most likely it will help out many people who want
to cross-compile. I might have missed several options out of the
Makefile.config, but those are the needed ones for the CompileFarm.