xfstests: add missing binaries to .gitignore

xfstests: add missing binaries to .gitignore

A clean checkout of xfstests followed by a build resulted in a long list
of untracked files. The current .gitignore ignores most binaries, but
the "dmapi" subdir was missed as were some binaries from the "src"
subdir.

Also ".libs" and ".ltdep" appear under a "dmapi" subdir, not just under
the top-level "libs" directory, so ignore those regardless of the
directory they are in.

Signed-off-by: Bill Kendall <wkendall@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>