Obsolete noopenh264 stub package
    
    The plan is to distribute the noopenh264 stub package in Fedora
    proper, and have the actual openh264 implementation from Cisco repos
    obsolete and replace it.
    
    See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=2247274 for the
    noopenh264 package review.
    
    This should finally get us to a point where we can get the openh264
    package automatically installed on Fedora Workstation on first update
    (see https://pagure.io/fedora-workstation/issue/84#comment-883140) and
    also opens up ways to build dependent packages that link with openh264,
    without actually including openh264 in the build roots.