Homebrew patch. Fixes MCPP compilation on Mac.

mcpp-fix-stpcpy.patch

stpcpy is a #define on Mac OS X.  Trying to define it as an extern is invalid.

diff -ur mcpp-2.7.2-orig/src/internal.H mcpp-2.7.2/src/internal.H
--- mcpp-2.7.2-orig/src/internal.H	2008-08-27 08:01:16.000000000 -0500
+++ mcpp-2.7.2/src/internal.H	2010-11-08 15:53:38.000000000 -0600
@@ -557,6 +557,6 @@
 #endif
 #endif
 
-#if HOST_HAVE_STPCPY
+#if HOST_HAVE_STPCPY && !defined(stpcpy)
 extern char *   stpcpy( char * dest, const char * src);
 #endif