Update tests without aclocal to expect failure

Update tests without aclocal to expect failure

Five tests use aclocal, but do not have a check for whether aclocal is
available to use. This causes reported tests failures in Linux From
Scratch and Darwin builds.

* tests/standalone.at: Add AT_XFAIL_IF check for aclocal for all tests.
* tests/subproject.at: Add AT_XFAIL_IF check for aclocal for last test.