cmake HAVE_FLOATABI_HARD examples

HDFGroup/hdf5 config/cmake/ZLIBNG/CMakeLists.txt :274 

check_c_source_compiles(
                            "#include <features.h>
                            int main() { return 0; }"
                            HAVE_FLOATABI_HARD)

InsightSoftwareConsortium/ITK Modules/ThirdParty/HDF5/src/itkhdf5/config/cmake/ZLIBNG/CMakeLists.txt :249 

check_c_source_compiles(
                            "#include <features.h>
                            int main() { return 0; }"
                            HAVE_FLOATABI_HARD)

InsightSoftwareConsortium/ITK Modules/ThirdParty/ZLIB/src/itkzlib-ng/CMakeLists.txt :238 

check_c_source_compiles(
                            "#include <features.h>
                            int main() { return 0; }"
                            HAVE_FLOATABI_HARD)