cmake HAVE_MREMAP examples

Unidata/netcdf-c CMakeLists.txt :1333 

CHECK_FUNCTION_EXISTS(mremap HAVE_MREMAP)

Stellarium/stellarium src/external/CMakeLists.txt :101 

check_symbol_exists(mremap sys/mman.h HAVE_MREMAP)

manticoresoftware/manticoresearch CMakeLists.txt :109 

check_function_exists ( mremap HAVE_MREMAP )