cmake: Build all deps and static link

CMakeLists.txt

cmake/CPM.cmake

cmake/Modules/FindGME.cmake

cmake/Modules/FindOPENMPT.cmake

cmake/Modules/FindSDL2.cmake

cmake/Modules/FindSDL2_mixer.cmake

src/CMakeLists.txt

src/sdl/CMakeLists.txt

src/sdl/mixer_sound.c

thirdparty/CMakeLists.txt

thirdparty/openmpt_svn_version.h