Add Windows ARM64 support

Separates the `Windows` platform into `Windows-x86_64` and
`Windows-ARM64`.

Author: Wunkolo

config.h

@@ -1,13 +1,19 @@
 #if defined(WIN32) || defined(_WIN32)
+#if defined(__aarch64__) || defined(_M_ARM64)
+#include "config_windows_aarch64.h"
+#elif defined(__amd64__) || defined(_M_AMD64)
 #include "config_windows_x86_64.h"
+#else
+#error "windows arch unsupported"
+#endif
 #elif defined(__gnu_linux__)
 #include "config_linux_x86_64.h"
 #elif defined(__ANDROID__)
 #if defined(__aarch64__)
 #include "config_android_aarch64.h"
 #elif defined(__amd64__)
 #include "config_android_x86_64.h"
-#elif
+#else
 #error "android arch unsupported"
 #endif
 #else