Update to pkg-config 0.26
    
    All patches are dropped since they were all upstreamed. pkg-config
    will no longer fallback to calling gnome-vfs-config, imlib-config,
    orbit-config, or gnome-config when the queried package is
    "libgnomevfs", "imlib", "orbit-client" or "orbit-server". I don't
    have any of these installed on my system. imlib-devel ships a .pc
    file these days, so do ORBit, and gnome-vfs is no longer in the distro
    (gnome-vfs-2.0 is), so this should be a safe change.