grep -P: fix it so backreferences now work with -w and -x

To implement -w and -x, we bracket the search term with parentheses.
However, that set of parentheses had the default semantics of
"capturing", i.e., creating a backreferenceable matched quantity.
Instead, use (?:...), to create a non-capturing group.
* src/pcresearch.c (Pcompile): Use (?:...) rather than (...).
* NEWS (Bug fixes): Mention it.
* tests/pcre-wx-backref: New file.
* tests/Makefile.am (TESTS): Add it.
This addresses http://debbugs.gnu.org/16865

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