Add support for libpcre2 (compiles and works) #1035
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I did a thing.
Add optional support to build with libpcre2.
Enable by passing --with-pcre2 to ./configure, the default is still to
build against legacy libpcre.
To facilitate compiling against either PCRE API version, an ag_pcre
wrapper API was created. This is done through a combination of AG_PCRE_*
defines and ag_pcre_* functions, plus typedefs ag_pcre_re_t and
ag_pcre_extra_t
At this point, ag can be built with libpcre or libpcre2 and passes tests
without modifying them. Preliminary testing hasn't shown much change in
speed, but further profiling should still be done.