OTHER: Enable fixed-height-mode again for playlist.

For some obscure reason you must always have multi-line strings
set when using fixed-height mode. Failing to do so will lock
the row height to one line forever. Workaround is to simply
initialize the row content with a newline.
OTHER: Add a dirty hack that finds latest gtk/cairo versions.
OTHER: Don't copy pango modules since they're built-in.
OTHER: Update to latest version of gtk/cairo.