pcre: Workaround bug #81101

The way to fix it is to disable certain match start optimizaions. The
observed performance impact appears negligible ATM, compared to the
functional regre

pcre: Workaround bug #81101

The way to fix it is to disable certain match start optimizaions. The
observed performance impact appears negligible ATM, compared to the
functional regression revealed.

A possible side effect might occur if a pattern uses (*COMMIT) or
(*MARK), which is however not a very broadly used syntax in PHP. Still
this should be observed and handled by possibly adding a possibility to
reverse PCRE2_NO_START_OPTIMIZE on the user side.

One test shows a behavior change, where instead of int 0 the match
would produce an error and return false. Except strict comparison
is used, this should be acceptable.

Signed-off-by: Anatol Belski <ab@php.net>
(cherry picked from commit d188ca7688315e3d32d41a32e0ce7b1f9bffb4cf)
Signed-off-by: Anatol Belski <ab@php.net>

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