Update torque_macros.cmake

Author: marauder2k7

Tools/CMake/torque_macros.cmake

@@ -176,7 +176,11 @@ function(add_math_backend name compile_defs)
         elseif(name STREQUAL "avx2")
             target_compile_options(math_${name} PRIVATE -mavx2 -mfma)
         elseif(name STREQUAL "neon")
-            target_compile_options(math_${name} PRIVATE -march=armv8-a)
+            include(CheckCXXCompilerFlag)
+            check_cxx_compiler_flag("-march=armv8-a" HAS_ARMV8_FLAG)
+            if(HAS_ARMV8_FLAG)
+                target_compile_options(math_${name} PRIVATE -march=armv8-a)
+            endif()
         endif()
     endif()