Fix intrinsics test

test/core/core_force_intrinsics.cpp

@@ -1,4 +1,6 @@
-#define GLM_FORCE_INTRINSICS
+#ifndef GLM_FORCE_INTRINSICS
+#	define GLM_FORCE_INTRINSICS
+#endif//GLM_FORCE_INTRINSICS
 #define GLM_FORCE_SWIZZLE
 #include <glm/ext/scalar_constants.hpp>
 #include <glm/ext/vector_relational.hpp>