cmake HAVE__FINITE examples

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

CHECK_FUNCTION_EXISTS(_finite HAVE__FINITE)

GenericMappingTools/gmt cmake/modules/ConfigureChecks.cmake :418 

check_symbol_exists (_finite   "${_math_h}" HAVE__FINITE)