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a89aa6f4 - gnulib-local: Work around regcomp.c compile error

gnulib-local: Work around regcomp.c compile error * gnulib-local/Makefile.am (EXTRA_DIST): Add lib/regcomp.c.diff. * gnulib-local/lib/regcomp.c.diff: New file, partially revert Gnulib commit f97745b0.