main/openjdk7: remove unused xulrunner from makedepends
main/php: build phpdbg

fixes #2683
main/php: install php-cli as default instead of php-cgi

when you do 'apk add php' you will not get /usr/bin/php instead of
/usr/bin/php-cgi

This is more logic.
main/php: upgrade to 5.6.2