zstd has similar time and space performance in compression but is
vastly faster in decompression, which benefits rootfs creation
(especially when installing very large packages) and on-target
package installation.
Also, ensure ZSTD_THREADS doesn't change sstate checksums. The
detailed explanation is in the commit making similar change for
XZ_THREADS.
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
