bug#27880: 25.2; elisp-mode-tests may downcase too aggressively

[Rob Browning]

[Refiling as a bug report from a list thread.]

It looks like (in 25.2, and perhaps master too) elisp-mode-tests.el
downcases the xref path (location) for comparison in
xref-elisp-test-run, but that seems to also affect the filesystem lookup
lower down (in xref--goto-location) such that a handful of tests fail if
the build path contains uppercase characters.  i.e. it tries to read the
downcased path, which of course (on ext4) doesn't exist.

In any case, I've hacked up a temporary fix by keeping the original as
"real-xref" and cloning that (and copying the location) to produce the
xref used by the modification and comparison.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
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