multimedia/ffmpeg: rebuild after r507592

By dropping COMPILER_PATH we've switched to base ld(1) which is LLD on
11.1+ aarch64, 12.0+ armv7, 12.0+ amd64, 12.1+ i386. So, track runtime
regressions explicitly. poudriere would've rebuilt due to r507574 anyway:
ffmpeg <- libva <- libdrm <- libpciaccess <- pciids.