* tools/dev/unix-build/Makefile.svn: In my custom build script,
   don't fail to configure gettext if 'gsed' is not found.
   The intention is to use 'gsed' if available, and fall back
   on 'sed' otherwise. The gettext build _requires_ GNU sed.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1577186 13f79535-47bb-0310-9956-ffa450edef68