The key change is that [`os.path.realpath(os.path.abspath('.'))`](https://searchfox.org/mozilla-central/rev/41c3ea3ee8eab9ce7b82932257cb80b703cbba67/build/moz.configure/init.configure#25) in 3.8 returns `C:/...` while 3.7 returned `c:/...`.
Bug 1628726 Comment 7 Edit History
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The key change is that [`os.path.realpath(os.path.abspath('.'))`](https://searchfox.org/mozilla-central/rev/41c3ea3ee8eab9ce7b82932257cb80b703cbba67/build/moz.configure/init.configure#25) in 3.8 returns `C:/...` while 3.7 returned `c:/...`. Filed https://bugs.python.org/issue40368.