* ext/digest/defs.h: better support for old Cygwin, again.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@3897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/digest/defs.h

@@ -18,7 +18,7 @@
 
 #if defined(HAVE_INTTYPES_H)
 # include <inttypes.h>
-#elif !defined __CYGWIN__ || !defined __INTTYPES_DEFINED__
+#elif !defined __CYGWIN__ || !defined __uint8_t_defined
   typedef unsigned char uint8_t;
   typedef unsigned int  uint32_t;
 # if SIZEOF_LONG == 8