devel/pecl-xdebug25 devel/pecl-xdebug-devel: Remove obsolete ports
pecl-xdebug25 was kept to support PHP 5.6, already expired and removed
pecl-xdebug-devel was useful to support the coming PHP 7.3.
Now, with a stable release that support all available PHP version,
the -devel ports is no longer necessary
PR: 236773
Sponsored by: trivago N.V.