[Vala] Patch to remove foreach as a keyword of genie

[Sandino Flores Moreno <tigrux gmail com>]

Genie does not allow methods named foreach

methods 'foreach' are very common in glib libraries (gst_tag_list_foreach,
g_thread_foreach, etc)

However, 'foreach' is not a keyword in the Genie language, so it can be safely
removed from the parser (genie uses the syntax for var in container)

I created a bug to track this issue.
https://bugzilla.gnome.org/show_bug.cgi?id=607884

The bug report has a patch to remove the issue:
https://bugzilla.gnome.org/attachment.cgi?id=152102

Please, commit it because this error blocks me
from using gst_tag_list_foreach