net/asterisk16: Add back g729 files distinfo

I removed these by mistake in commit 99857c53ae27

PR: 257478
Reported by: OlivierW <olivierw1+bugzilla-freebsd@hotmail.com>
MFH: 2021Q3

(cherry picked from commit 5b00c6830a95f8841f24f955d3c3ba9885707786)