match_pattern support for .a files linked in shared libs

[Jacob Meuser]

When libtool is given a .a to link into a shared library, if
deplibs_check_method != pass_all, it doesn't link.  However,
both NetBSD and OpenBSD allow shared libs to be built with
certain .a files, as per match_pattern.

Here is a patch against branch-1-5.

I ripped the match-pattern_regex from another part of libtool.

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patch-ltmain_in-1-5
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