pkg-descr states falsely that its the meta-port for PHP 7.1, even
for PHP 7.2 and 7.3. This commit fixes the typo for each version.
Reported by: leres@freebsd.org
Notable changes:
- Switch from PCRE to PCRE2
- Many modules now require PCRE2 for building
- graphics/php73-gd: X11 option is no longer default
Changes to Mk/Uses/php.mk approved by ale