add github version to patchlevel string

Author: Charlie Somerville

version.h

@@ -1,6 +1,7 @@
 #define RUBY_VERSION "2.0.0"
 #define RUBY_RELEASE_DATE "2013-06-27"
 #define RUBY_PATCHLEVEL 247
+#define RUBY_GITHUB_VERSION 1
 
 #define RUBY_RELEASE_YEAR 2013
 #define RUBY_RELEASE_MONTH 6
@@ -19,7 +20,7 @@
 #if RUBY_PATCHLEVEL == -1
 #define RUBY_PATCHLEVEL_STR "dev"
 #else
-#define RUBY_PATCHLEVEL_STR "p"STRINGIZE(RUBY_PATCHLEVEL)
+#define RUBY_PATCHLEVEL_STR "p"STRINGIZE(RUBY_PATCHLEVEL) "-github"STRINGIZE(RUBY_GITHUB_VERSION)
 #endif
 
 #ifndef RUBY_REVISION