Skip tests if test subdir is missing
Problem reported by Jeffrey Walton in: https://lists.gnu.org/r/emacs-devel/2019-05/msg00041.html * Makefile.in (CHECK_TARGETS): New macro; use it to simplify 'check' and similar rules. ($(CHECK_TARGETS)): If tests are missing, do not fail after issuing a diagnostic. Just skip the tests.
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