[3.11] gh-110429: Fix race condition in "make regen-all" (GH-110433) #110439
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"make regen-pegen" now creates a temporary file called "parser.c.new"
instead of "parser.new.c". Previously, if "make clinic" was run in
parallel with "make regen-all", clinic may try but fail to open
"parser.new.c" if the temporay file was removed in the meanwhile.
(cherry picked from commit fb6c4ed)
Co-authored-by: Victor Stinner [email protected]