update platform macros

Author: jamierpond

inc/zoo/pp/platform.h

@@ -1,16 +1,16 @@
 #ifndef ZOO_PLATFORM_MACROS_H
 #define ZOO_PLATFORM_MACROS_H
 
-#ifdef _MSC_VER
+#ifdef __AVX2__
+#define ZOO_CONFIGURED_TO_USE_AVX 1
+#else
+#define ZOO_CONFIGURED_TO_USE_AVX 0
+#endif
 
+#ifdef _MSC_VER
 #define MSVC_EMPTY_BASES __declspec(empty_bases)
-
 #else
-
 #define MSVC_EMPTY_BASES
-
-#define ZOO_CONFIGURED_TO_USE_AVX defined(__AVX2__) // TODO bring this in from CMake
-
 #endif
 
 #endif