Updated patch comment

vigra/makefile.mk

@@ -59,9 +59,9 @@ PATCH_FILES += vigra1.4.0-unused-parameters.patch
 # the closing brace of the enum-specifier (see [dcl.enum] in the C++ 2003
 # Standard), leading to "comparison between <enum1> and <enum2> [-Werror=enum-
 # compare]" and "enumeral mismatch in conditional expression [-Werror]"
-# warnings (see <https://mailhost.informatik.uni-hamburg.de/pipermail/vigra/
-# 2012-March/000956.html> "GCC 4.7 picky about sized_int.hxx (-Werror=enum-
-# compare)" about getting this upstreamed):
+# warnings (included upstream as <https://github.com/ukoethe/vigra/commit/
+# e0dcd31c76bb13c98920e21544b309ca47bb3c5c> "added explicit cast (gcc 4.7
+# compatibility patch by Stephan Bergmann)"):
 PATCH_FILES += vigra1.4.0-enumwarn.patch
 
 CONFIGURE_DIR=