Auto merge of #16505 - aneeshusa:stop-mach-bootstrap-from-segfaulting, r=Wafflespeanut

Stop mach bootstrap from segfaulting

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See the commit message for details; the top-level import of Mako causes `./mach bootstrap` to segfault in glibc while exiting, seems to have to do with the native `_speedups.so` library of MarkupSafe, a Mako dependency.

Needed for servo/saltfs#631.
cc @emilio to make sure this is OK for stylo (e.g. #13171)

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- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #12103 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because the test is part of servo/saltfs#631

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