Change License field to LGPL-2.1 to prevent rpminspect test to fail
    
    The dist.rpminspect.analysis.license test fails with the following error:
    
    "LGPLv2.1 is not an approved license"
    
    This is because the license short string is not listed in the rpminspect
    license database. For LGPLv2.1, the LGPL-2.1 short string should be used.
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>