[issue35921] Use ccache by default

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

time -p make CC="/usr/bin/ccache gcc" --jobs 4 --silent > stdout.txt ^ stderr.txt

real 4.36
user 3.69
sys 1.73

on a 4-thread CPU

i7-7560U CPU @ 2.40GHz

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nosy: +matrixise

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<https://bugs.python.org/issue35921>
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