package/audiofile: drop package

The audiofile package is affected by multiple CVEs and is not maintained
anymore (no release since 2013):

  https://nvd.nist.gov/vuln/search/results?form_type=Advanced&results_type=overview&seach_type=all&query=cpe:2.3:a:audio_file_library_project:audio_file_library:0.3.6:*:*:*:*:*:*:*



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>