Update "missing" scripts to automake-1.15
    
    Fixes:
       $./framework/autogen.sh
       ...
       setroubleshoot/framework/missing: Unknown `--is-lightweight' option
       Try `setroubleshoot/framework/missing --help' for more information
       configure: WARNING: 'missing' script is too old or missing
       ...
    
    Signed-off-by: Vit Mojzis <vmojzis@redhat.com>