regex-tests, regex: fix bug: memset undeclared * tests/test-regex.c: Don't include regex.h twice. Include string.h, to declare memset. Christensen's report also mentioned this issue. * m4/regex.m4 (gl_REGEX): Keep test program more in sync with test-regex.c, to avoid future problems like this. Remove AC_INCLUDES_DEFAULT. Include <string.h>. Don't include <regex.h> twice.

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