navit: add PACKAGECONFIG for imlib2, qt, gtk, sdl

* fixes following issues from test-dependencies report:
  navit/navit/latest lost dependency on  fribidi
  navit/navit-graphics-gtk/latest lost dependency on  imlib2
  navit/navit-graphics-sdl/latest lost dependency on  eglibc freetype

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>