cmake HAVE_AL_H examples

wang-bin/QtAV src/CMakeLists.txt :122 

check_include_files(AL/al.h HAVE_AL_H)

skyjake/Doomsday-Engine doomsday/apps/client/libs/openal/CMakeLists.txt :14 

check_include_file (al.h HAVE_AL_H)

skyjake/Doomsday-Engine doomsday/apps/client/libs/openal/CMakeLists.txt :16 

add_definitions (-DHAVE_AL_H=1)