Comment # 5 on bug 1179023 from Jean Delvare

After further analysis, it turns out that rpmbuild is not to blame. The
resolution of symbolic links is done by the kernel itself when we figure out
(via procfs) the path to the patch file which was passed to the patch utility
through stdin. Illustration:

$ readlink /proc/self/fd/0 < /tmp/foo/openSUSE:Factory/quilt/expand.diff
/tmp/openSUSE:Factory/quilt/expand.diff

So a better fix is possible. Working on it.