Patch by Rov Juvano. thanks.

This removes dummy wakeups, and fixes a deadlock when quitting while
reading from a FIFO.

to produce well-formed pkg-config files.

Require it in configure as well.

This seems to solve the invalid handle problem, as pointed out by
Laurent. However, I get a poststamp-sized video output now...

until someone manages to fix it.

That would need to be properly fix with the new embedded vout API

Except that this still returns an X11 invalid handle

Except that this returns an invalid X11 handle.

Fix toggling of transparency on teletext pages. Keep in mind that the subpicture core seems to be broken. It doesn't remove old subpictures with the ephemer setting as it used to do.

This reverts commit 4e497a21.