audio/abcde: Update from 2.8.1 to 2.9.1

Changelog: https://git.einval.com/cgi-bin/gitweb.cgi?p=abcde.git;a=blob;f=changelog;h=7794b57256ded379a8c00cd4d74c84a628b30c19;hb=ff4100f967b74171b27f4a7038e87082aa6e6bf2