[issue43617] Missing definition in configure.ac causing autoreconf to create damaged configure script

[Eli Schwartz]

Eli Schwartz <eschwartz93 at gmail.com> added the comment:

Hmm, I've seen this accomplished elsewhere using m4_pattern_forbid, which would make autoreconf fail with the following message:

```
configure.ac:17: error: possibly undefined macro: AX_C_FLOAT_WORDS_BIGENDIAN
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
configure.ac:5586: error: possibly undefined macro: AX_CHECK_OPENSSL
autoreconf: error: /usr/bin/autoconf failed with exit status: 1
```

Example patch attached.

----------
nosy: +eschwartz
Added file: https://bugs.python.org/file49954/0001-configure-use-m4-forbidden-patterns-to-ensure-autore.patch

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