[3.7] bpo-33128 Fix duplicated call to importlib._install_external_importers (GH-6273) #6592
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External importers were being added in both phases of the import
system initialisation.
They're only supposed to be added in the second phase, after the
import machinery has been appropriately configured.
(cherry picked from commit 0977091)
Co-authored-by: Pablo Galindo Pablogsal@gmail.com
https://bugs.python.org/issue33128