Snippets for amsynth 1.13.3 from FreeBSD 150amd64

Sourced from https://pkg-status.freebsd.org/beefy23/data/latest-per-pkg/amsynth/1.13.3_1/150amd64-default.log.

• /usr/local/include/alsa/seq_event.h:30:2: warning: "use #include <alsa/asoundlib.h>, <alsa/seq_event.h> should not be used directly" [-W#warnings]
     30 | #warning "use #include <alsa/asoundlib.h>, <alsa/seq_event.h> should not be used directly"
        |  ^