rpm/kernel-obs-build.spec.in: reduce initrd functionality
    
    For building in OBS, we always build inside a virtual machine
    that gets a new, freshly created scratch filesystem image. So
    we do not need to handle fscks because that ain't gonna happen,
    as well as not we do not need to handle microcode update in the
    initrd as these only can be run on the host system anyway. We
    can also strip and hardlink as an additional optimisation that
    should not significantly hurt.