build-system/gnu: Limit load average.

A nice feature of offload builds is that Guix will throttle the start of
new jobs based on the overload-threshold.  There is no equivalent for
local builds, so one must either run builds in serial (--max-jobs=1) and
endure single-threaded builds or run concurrent builds and watch the
system overload as it runs multiple multi-threaded builds.

From a benchmark comparing the compilation of concurrent Folly builds,
the "max-load" option reduced the overall time by 8.3%. Memory use also
drops considerably since we are only running 1/4 of the processes at any
time.

* guix/build/gnu-build-system.scm (build, check): Set max load.

Change-Id: I97f1e3e59880b6ed23faed2038eb5279415e9c95
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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