The message printed by the #error macro should be enclosed in marks
for gcc.

Bug: angleproject:2995

Change-Id: I5d8ebb28ef5e225eb88990642b6b58936cad4369
Reviewed-on: https://chromium-review.googlesource.com/c/1407542Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>