Fix #78349: Bundled pcre2 library missing LICENCE file #4483
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Fixes https://bugs.php.net/bug.php?id=78349
The PCRE library is noted in short on two places:
so contributors know where to send patches to upstream and users are
now also more familiar with its LICENSE and basic info. Other
documentation related files are not included since they might get
outdated soon. Links to upstream location is better way to note its
usage, their authors and its license.
P.S: LICENSE file is bundled from the upstream PCRE 10.33 release