[issue23160] Respect the environment variable SVNROOT in external-common.bat

[Roundup Robot]

Roundup Robot added the comment:

New changeset 45e2c95bb802 by Steve Dower in branch '3.4':
Closes #23160: Respect the environment variable SVNROOT in external-common.bat (patch by anselm.kruis)
https://hg.python.org/cpython/rev/45e2c95bb802

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