[bug #44555] "make" fails to use parallelism

[Jeff Epler]

Follow-up Comment #16, bug #44555 (project make):

Hi!  I am sad to say, I missed that this bug had been fixed at the time. 
Thank you so much for incorporating the fix!

I can confirm that using make 4.2.1 fixes this problem for us, and we no
longer have to carry this patch locally.

Additionally, I checked whether the subsequent, not yet released, change to
posix_spawn affects performance.  It appears to be a slight regression, with
4.2.1 taking about 16.3s on my current test system (8-core digitalocean "CPU
optimized" droplet) and git taking 17.5s.  Using "./configure
--disable-posix-spawn" goes back down to 16.4s, so most of the slowdown is due
to posix_spawn. (run to run variance is on the order of .1s at most, so 16.3
-> 17.5 is actually a difference, but 16.3 vs 16.4 may not be)

(these timings are on the "mkmk.sh" testcase I posted in an earlier comment,
on a digitalocean 8-core "CPU-optimized" droplet running Debian 10 "Stretch")

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