openttd: add reference to upstream bug for patch
--- trunk/dports/games/openttd/Portfile 2015-01-31 17:15:33 UTC (rev 132406)
+++ trunk/dports/games/openttd/Portfile 2015-01-31 17:16:29 UTC (rev 132407)
@@ -47,6 +47,7 @@
patchfiles patch-config.lib-remove-deployment-target.diff \
patch-src__fontcache.cpp-signed-vs-unsigned-max.diff
+ # see https://bugs.openttd.org/task/6223
configure.env-append \
CFLAGS_BUILD="${configure.cflags}" \