Adapt dialyzer_reference to ba466e2d changes
distclean: do not remove plt
Merge pull request #382 from tuncer/update-dialyzer

Adapt dialyzer_reference to ba466e2d changes
Fix Dialyzer warning introduced in 0caf047f
Merge pull request #385 from tuncer/dialyzer-warning

Fix Dialyzer warning introduced in 0caf047f
Add {prefix, atom()} option for abnfc_opts

Specify the atom to use as a prefix for the decoder and generator
functions inside the parser's module.  Default is ''.
Add {parser, module()} option for abnfc_opts

Specify the module to use for parsing the ABNF grammars.  Default is
'abnfc_rfc4234'.
Add {qc, proplist()} option for abnfc_opts

Specify the options to use for the generator functions inside the
parser's module.  Default is [].