fix ecore-glib reentrance

fix ecore-glib reentrance

if using ecore_main_loop_begin() multiple times (reentrant/recursive)
with glib doing threads, then it would deadlock since the same thread
would get the lock it already have.

multiple ecore_main_loop_begin() is required to implement WebKit's
alert/confirm/prompt dialogs since there is no async reply with
callbacks, rather one must return the value.

By: Lucas de Marchi

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/ecore@46361 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33