cmake HAVE_POWER8_INTRIN2 examples

InsightSoftwareConsortium/ITK Modules/ThirdParty/ZLIB/src/itkzlib-ng/cmake/detect-intrinsics.cmake :401 

check_c_source_compiles(
            "#include <sys/auxv.h>
            #include <linux/auxvec.h>
            int main() {
                return (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07);
            }"
            HAVE_POWER8_INTRIN2
        )

InsightSoftwareConsortium/ITK Modules/ThirdParty/ZLIB/src/itkzlib-ng/cmake/detect-intrinsics.cmake :412 

unset(HAVE_POWER8_INTRIN2 CACHE)