Fix external pcre2 build (#13662)

PCRE2_EXTRA_CASELESS_RESTRICT is only available as of pcre2 10.43.
Note: no check is necessary for pcre2_set_compile_extra_options because
it is ava

Fix external pcre2 build (#13662)

PCRE2_EXTRA_CASELESS_RESTRICT is only available as of pcre2 10.43.
Note: no check is necessary for pcre2_set_compile_extra_options because
it is available since pcre2 10.30, which is the minimum version PHP
requires.

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ext/pcre: Add "/r" modifier (#13583)

Adds support for "Caseless restricted" matching added in PCRE2lib
10.43 with the "r" modifier.

This is `PCRE2_EXTRA_CASELESS_RESTRICT` in PC

ext/pcre: Add "/r" modifier (#13583)

Adds support for "Caseless restricted" matching added in PCRE2lib
10.43 with the "r" modifier.

This is `PCRE2_EXTRA_CASELESS_RESTRICT` in PCRE2. This is an "extra"
option, which means it is not possible to pass this option as
pcre2_compile() function parameter.

This option is passed in a pcre2_set_compile_extra_options() call.
Previously, these extra options are set at php_pcre_init_pcre2(),
but after this change, it is possible to customize the options
by adding bits to `eoptions` in pcre_get_compiled_regex_cache_ex().

The tests for this change are ported from upstream test suite[^1].

[^1]: https://github.com/PCRE2Project/pcre2/commit/c13d54f6581#diff-8c8312e4eb2d35bb16485404b7b5cc0eaef0bca1aa95ff5febf6a1890048305c

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