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Enable limiting of compression threading

Dylan Aïssi requested to merge daissi/linux:daissi/limit-compression-threading into master

The xz compression is currently being configured to use a number of worker threads equal to the processors on the system being used. This is generally OK, however in some instances we compile packages on large machines, with as many as 160 CPU cores. This results in memory allocation issues:

[ 1137s] find 'linux-source-6.1' \
[ 1137s]     -name '*.pyc' -prune -o \
[ 1137s]     -print0 | \
[ 1137s]     sort -z | \
[ 1137s]     tar --owner=root --group=root --numeric-owner \
[ 1137s]         --no-recursion --null -T - -c | xz -T0 > 'linux-source-6.1.tar.xz'
[ 1137s] xz: (stdin): Cannot allocate memory
[ 1137s] make[2]: *** [debian/rules.real:84:debian/build/linux-source-6.1.tar.xz] Error 1

When we are setting the "parallel" setting in "DEB_BUILD_OPTIONS", use this to set the number of threads used for compression.

Signed-off-by: Martyn Welch martyn.welch@collabora.com

CC @martyn-guest

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