[Bug 271798] multimedia/ffmpeg: Enable LTO by default on aarch64 and amd64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271798

--- Comment #2 from Jan Beich <jbeich@FreeBSD.org> ---
If LTO has placebo benefit then the port option should be removed in favor of
WITH_LTO via Mk/Features/lto.mk e.g., to reduce maintenance. LTO isn't safe
with mixed alignment (e.g., in dav1d) or mixed toolchain (LLVM bitcode vs. GCC
GIMPLE when using static libraries) but I didn't notice issues when dogfooding
LTO in ffmpeg.

Examples documenting statistical difference:
- ports d4e1f93dbb3a (svt-av1)
- ports 32c2b95c682e (libjxl)
- ports 501e1ed88f97 (foot)

However, ports 55006395d27c (mesa-devel) and ports 6ec985b72d58 (firefox)
relied on upstream benchmarks.

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