In #32635, it was discovered that _cryptmodule.c was missing a dependency on crypt.h, which caused it to segfault when it was missing the proper prototype for crypt. This was fixed by adding an #include <crypt.h> to Python.h.

This include doesn't need to be in the public header; it only needs to be in _cryptmodule.c. Removing it from the public header is helpful for packagers, because it means that the libpython-dev (or whatever) package doesn't need a dependency on libcrypt-dev, only on the libcrypt runtime library.