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PeterN

Fix #10343: Don't extend town-disallowed roadtypes. (#10347)

Towns currently don't build disallowed roadtypes, however they should
also not extend disallowed roadtypes as well.

If the roadtype that cannot be extended happens to be the roadtype that
the town was going to build then this restriction is ignored.

# Autodetect if xaudio2 can be used.

include(CheckCXXSourceCompiles)
set(CMAKE_REQUIRED_FLAGS "")

check_cxx_source_compiles("
    #include <cstdio>
    #include <windows.h>

    #undef NTDDI_VERSION
    #undef _WIN32_WINNT

    #define NTDDI_VERSION    NTDDI_WIN8
    #define _WIN32_WINNT     _WIN32_WINNT_WIN8

    #include <xaudio2.h>
    int main() { printf(\"%s\\\\n\", XAUDIO2_DLL_A); return 0; }"
    XAUDIO2_FOUND
)