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pyximport: fix a bug crashing other processes
pyxbuild overwrites .so file contents, corrupting any mmapped code image loaded. If pyximporting the same module from two different processes, on Linux this leads to crashes with bus error. This commit fixes the issue by unlinking the file first. On Linux et al., this does not change the file contents of any open FDs. On Windows, unlinking fails, and we just switch to using a different file name.
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