Little CMake touches

[madebr]

• make sure the created .map files are correct. Don't use list(APPEND), but use set(A "${A}newline"). It doesn't matter much, but I made sure the generated map file are indented correctly.
• check_c_source_runs cannot be used when cross compiling. check_c_source_compiles links an executable, so that can be used.
• Create a WavPack::WavPack target. With this change, wavpack can be used as:

  option(MYGAME_WAVPACK_VENDORED "Use vendored WavPack")
  if(MYGAME_WAVPACK_VENDORED)
  add_subdirectory(vendored/wavpack EXCLUDE_FROM_ALL)
  else()
  find_package(wavpack REQUIRED)
  endif()
  target_link_libraries(mygame PRIVATE WavPack::WavPack)

• Build cooledit and winamp plug-ins as module. The main difference is no import library is generated, which is not needed as these libraries are supposed to be used with LoadLibraryA and not linked against at build time.

[dbry]

Great, this works fine for me too! Will test the cooledit and winamp plugins next. Thanks @madebr !

[madebr]

Glad I could be of help :)