[issue37031] signalmodule.c: reuse runtime->main_thread

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:


New changeset b49858b4b7b4c9d85ef6946ad020f83e4fa1caa7 by Victor Stinner in branch 'master':
bpo-37031: Fix PyOS_AfterFork_Child() (GH-13537)
https://github.com/python/cpython/commit/b49858b4b7b4c9d85ef6946ad020f83e4fa1caa7


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