Revert "Fix iosched warning when using CFQ"
    
    This reverts commit eae4bf58928ded378cee9bdf5712d11a95a39219.
    
    The function required to make this work was unexported in Linux 5.0.
    Allow loading the module on 5.0 at the expense of spamming dmesg when
    using CFQ on older kernels.
    
    Resolves: #178
    Reopens: #6