The aim is to improve the efficiency of computing the man pages database,
which must decompress the man pages. Zstd is faster than gzip, especially for
decompression, and has a similar compression ratio.
* gnu/packages/commencement.scm (%final-inputs): Add zstd.
* guix/build/gnu-build-system.scm
(compress-documentation) Update doc.
<info-compressor, info-compressor-flags, man-compressor, man-compressor-flags>
<man-compressor-file-extension>: New arguments.
<compressed-documentation-extension>: Rename argument to...
<info-compressor-file-extension>: ... this. Add an 'extension' argument to
the retarget-symlink nested procedure. Use new arguments in nested
'maybe-compress' procedure.
Reviewed-by: Ludovic Courtès <ludo@gnu.org>
Change-Id: Ibaad4658f8e5151633714d263d9198f56d255020
dfd18d0d75