Update to 0.15.0
    Add BuildRequires for cups-devel and Requires for cups-filesystem
    Replace mention of avcodec with avcodec2
    Drop xpra-unbundle-rencode.patch, and no longer patch to use system
    rencode
    Drop xpra-0.14-stop-using-void-driver.patch
    Drop xpra-0.14.22-fedora22-xorg.patch