net/asterisk13: Add back g729 files distinfo

I removed these by mistake in commit 8b16d6122cdd

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

(cherry picked from commit d2f8bdb85a74ded5cb4e0281a0204330b0223590)