Fix two tests

Fix two tests

* test/lisp/progmodes/elisp-mode-tests.el (xref-elisp-test-run):
Make sure file names can be compared as strings, by running them
through 'file-truename'.  Reported by Vin Shelton
<acs@alumni.princeton.edu>.
* test/lisp/emacs-lisp/bytecomp-tests.el ("warn-obsolete-hook.el")
("warn-obsolete-variable.el"): Use [^z-a] to match a newline as
well.  Reported by Vin Shelton <acs@alumni.princeton.edu>.