cmake CXX_COMPILER_HAVE_AVX512_MACRO examples

QMCPACK/qmcpack CMake/CheckSIMDAlignment.cmake :4

try_compile(CXX_COMPILER_HAVE_AVX512_MACRO ${CMAKE_BINARY_DIR} ${PROJECT_CMAKE}/try_compile_sources/check_AVX512.cpp
            CMAKE_FLAGS "${CMAKE_CXX_FLAGS}")