NSProxy.m: Tiny compile problem on windows

[Roland Schwingel]

Hi...

When trying to compile 1.7.2 on windows I can't get NSProxy.m compiled, 
because it cannot find UINT_MAX definition. I had to add these to 
NSProxy.m to the include section to get it compiled... Maybe NSProxy.m 
should be changed that way...

#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

Thanks,

Roland