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Remove some unused defines in multiprocessing.h. (GH-15661)

It looks like they are unused since
87cf220972c9cb400ddcd577962883dcc5dca51a.
S
Sergey Fedoseev committed
32f825393e5836ab71de843596379fa3f9e23c7a
Parent: 3ccdbc3
Committed by Serhiy Storchaka <storchaka@gmail.com> on 9/7/2019, 7:44:36 AM