cmake HAVE__FINITE examples

Froser/gamemachine src/3rdparty/openal-soft-1.19.1/CMakeLists.txt :603 

CHECK_FUNCTION_EXISTS(_finite HAVE__FINITE)

EvEmu-Project/evemu_Crucible CMakeLists.txt :139 

CHECK_CXX_SYMBOL_EXISTS( _finite  "cfloat" HAVE__FINITE )