Mk/Uses/php.mk: Add DEV_WARNING for USES=php:pecl

• php has declared pecl infrastructure as deprecated in lieu of pie
• Considering this add a warning for DEV to convert these packages to standard extensions
• Most of the pecl ports have an upstream src repo in a version control system
• Move the port with a prefix name php-, update the MASTER_SITES and use USES=php:ext
• Update the reverse dependencies
• If you are a non-committer feel free to reach out for necessary assistance