specs: add pending guards to weird Travis failures.
specs: add pending guards to weird Travis failures.

* specs/posix_spec.yaml: Mark pending those examples inexplicably
failing on Travis, per github issue #102.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

ardje/luaposix,luaposix/luaposix,zevv/luaposix,snegovick/luaposix,rrthomas/luaposix,jimmyharris/luaposix,jimmyharris/luaposix,zevv/luaposix,ardje/luaposix,snegovick/luaposix,rrthomas/luaposix