BLD: fix potential issue with escape sequences in __config__.py
#25670
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Backport of #25669.
The current code isn't robust to backslashes (from path segments on Windows) in linker flags. No bug report for NumPy, but the same problem did show up in SciPy already. Fix is the same as scipy/scipy#19945.
This actually pulls in all of
__config__.py
from main because there have been a number of other changes.[skip cirrus] [skip circle]