WebKit -> Python dependency

[Stefan Farfeleder]

Hi,

I think the www/webkit-gtk2 port lacks a dependency to Python. At least
it fails to build if it is not installed:

checking for perl... /usr/bin/perl
checking for python... no
configure: error: You need 'python' to compile WebKit
===>  Script "configure" failed unexpectedly.

Not sure why I don't have python anymore, actually. I think portmaster
uninstalled it for some reason. Portmaster -a wants to install python,
but, lacking the dependency, after www/webkit-gtk2.

Stefan