cryptsetup-generator: guess whether the keyfile argument is two items or one
    
    Fixes #13615.
    
    See the inline comment for documentation.
    
    (cherry picked from commit 32c6237a7c2e697d2fc4f3403319db16858fb8e3)
    
    Related: #1763155
    
    patch_name: 0301-cryptsetup-generator-guess-whether-the-keyfile-argum.patch
    present_in_specfile: true
    location_in_specfile: 301
    squash_commits: true