Revert "geeqie: xxd is required as build dependency"

This reverts commit 852f0bf2d4f4ae2c58fd414e628d841879163386. Geeqie
builds fine without vim.
geeqie: Don't use fetchgit

Fetchgit considered harmful.
geeqie: Disable libchamplain dependency for now

It causes Geeqie to depend on both GTK+ 2 and 3, which is undesirable.