cmake DOPENXR_HAVE_COMMON_CONFIG examples

scp-fs2open/fs2open.github.com lib/openxr/src/CMakeLists.txt :322 

add_definitions(-DOPENXR_HAVE_COMMON_CONFIG)

RavEngine/RavEngine deps/OpenXR-SDK/src/CMakeLists.txt :298 

add_definitions(-DOPENXR_HAVE_COMMON_CONFIG)

rbfx/rbfx Source/ThirdParty/OpenXRSDK/src/CMakeLists.txt :320 

add_definitions(-DOPENXR_HAVE_COMMON_CONFIG)