Avoid two more encroachments by Windows into the user's namespace.

"hyper" is described here: https://sourceforge.net/p/mingw/mailman/message/8593274/

"rad1" is described here: http://lolengine.net/blog/2011/3/4/fuck-you-microsoft-near-far-macros

sysconfig.h

@@ -250,6 +250,11 @@
 #define HYPERPATH ""
 #endif
 
+#if ISWINDOWS
+#define hyper fake_hyper // avoid "hyper" typedef in <_mingw.h>
+#define WIN32_LEAN_AND_MEAN // avoid "rad1" macro in <windows.h>
+#endif
+
 #include <stdio.h>
 
 #if CAP_SDL
@@ -407,3 +412,7 @@ extern "C" {
 #if CAP_SDL
 union SDL_Event;
 #endif
+
+#if ISWINDOWS
+#undef hyper  // avoid "hyper" typedef in <_mingw.h>
+#endif