LTO object files will now be compressed using zstd.
Compressing debug sections with zstd will have to wait for GCC 13,
which adds support for -gz=zstd.
NOTE: wiping the ccache is strongly recommended, not doing so might
yield build error later on:
"lto1: internal compiler error: original not compressed with zstd"
Signed-off-by: Andre Heider <a.heider@gmail.com>
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