updated for version 7.3.848

Problem:    Can't build with Ruby 2.0 when using MinGW x64 or MSVC10.
Solution:   Fix it. Also detect RUBY_PLATFORM and RUBY_INSTALL_NAME for x64.
            (Ken Takata)

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    848,
 /**/
     847,
 /**/