audio/libmysofa: Update to 1.3.4
Previous v1.3.3 tag was surprisingly yoinked after a year and a half, so
MFH'ing this to ensure distfile availability.
https://github.com/hoene/libmysofa/releases/tag/v1.3.4
MFH: 2026Q2
(cherry picked from commit 9ca585df17d7fea2b9634cc726cc9cf2b5964323)