Add missing MSVC include in hashfuncs.

Author: Faless

include/godot_cpp/templates/hashfuncs.hpp

@@ -31,6 +31,11 @@
 #ifndef HASHFUNCS_HPP
 #define HASHFUNCS_HPP
 
+// Needed for fastmod.
+#if defined(_MSC_VER)
+#include <intrin.h>
+#endif
+
 #include <godot_cpp/core/math.hpp>
 #include <godot_cpp/core/object.hpp>
 #include <godot_cpp/variant/aabb.hpp>