gh-125206: don't use CMPLX in configure test by skirpichev · Pull Request #132865 · python/cpython

How can I test this change? On my Fedora 42 with clang 20.1.2, complex is already detected as supported:

$ ./configure CC=clang LD=clang
(...)
checking libffi has complex type support... yes
(...)

We need glibc as libc & clang version ancient enough. v14 (default for Debian 12) - "works for me".

Merged, thanks. Let's hope that it works on old clang versions :-)