cmake OpenSL examples

kcat/openal-soft CMakeLists.txt :1242 

find_package(OpenSL)

axmolengine/axmol 3rdparty/openal/CMakeLists.txt :1193 

find_package(OpenSL)

glKarin/com.n0n3m4.diii4a Q3E/src/main/jni/doom3/neo/externlibs/openal-soft/CMakeLists.txt :1149 

find_package(OpenSL)

liballeg/allegro5 addons/audio/CMakeLists.txt :179 

find_package(OpenSL)