cmake HAVE_NEARBYINTF examples

llvm-dcpu16/llvm-dcpu16 cmake/config-ix.cmake :117 

check_symbol_exists(nearbyintf math.h HAVE_NEARBYINTF)

KhronosGroup/SPIRV-LLVM cmake/config-ix.cmake :162 

check_symbol_exists(nearbyintf math.h HAVE_NEARBYINTF)