Remove references to lesscpy
    
    We believe that nodejs-lessc will always be the preferred option, and
    lesscpy does not support all of the features we need.
    Instead, we will just run lessc in patchsets where the less sources
    change.
    
    Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
    Reviewed-by: Howard Johnson <merlin@merlinthp.org>