If available, use GNU parallel to run N make_installer.pl scripts in
parallel, to scale packaging LibreOffice up with the rest of gbuild.
* fallback if no GNU parallel found - run make_installer sequentially
as before
* push most of the make_installer.pl input param tweaks from gbuild
down into a shared call_installer.sh script
* call gnu parallel with generated number of
"templ:lang:prodname:ext:pkgfmt:strip-flag" tuples, one for each
package to build (empty templ for non-windows, to save on cmd line
length)
* such that we can run all those in parallel (taking into account
the build's PARALLELISM parameter)
* there's still the main package build running epm sequentially for
umpteen sub-packages from within _one_ make_installer.pl instance, but
that's much harder to parallelize from inside Perl (so we punt on
that here)
Change-Id: Ie7d3084ed60d003d587c5e64dc9fb1809b23e409
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133957
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
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