Regression tests FAILs with older format repositories

I ran the regression tests with SERVER_MINOR_VERSION=3 to see what
happened and I got lots of mergeinfo FAILs. The more significant fail
is:

$ ./fs-test --server-minor-version=4 34
lt-fs-test: ../src/subversion/libsvn_subr/dirent_uri.c:1456: svn_relpath_skip_ancestor: Assertion `relpath_is_canonical(parent_relpath)' failed.

The same test passes using 1.7 so I think this could break 1.8 support
for old format repositories. It is fallout from:

r1188639 | julianfoad | 2011-10-25 13:51:35 +0100 (Tue, 25 Oct 2011) | 40 lines

Eliminate svn_relpath__is_child(); use svn_relpath_skip_ancestor() instead.

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