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Mimalloc header is not installed #116984

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@oraluben

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@oraluben
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Bug report

Bug description:

Mimalloc is introduced in #109914.
This will cause a header not found when building any extension that includes a pycore_*.h header as:

[build] In file included from /Users/yyc/repo/py/install/include/python3.13d/internal/pycore_long.h:13:
[build] In file included from /Users/yyc/repo/py/install/include/python3.13d/internal/pycore_runtime.h:17:
[build] In file included from /Users/yyc/repo/py/install/include/python3.13d/internal/pycore_interp.h:30:
[build] /Users/yyc/repo/py/install/include/python3.13d/internal/pycore_mimalloc.h:39:10: fatal error: 'mimalloc.h' file not found
[build] #include "mimalloc.h"
[build]          ^~~~~~~~~~~~
[build] 1 error generated.

See following PR for detail.

CPython versions tested on:

3.13, CPython main branch

Operating systems tested on:

Linux, macOS

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