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- lib557: suppress `-Wformat-overflow` warning in source.
Fixes:
```
lib557.c: In function ‘test_float_formatting’:
lib557.c:1408:37: error: ‘%*f’ directive output of 2147483648 bytes exceeds ‘INT_MAX’ [-Werror=format-overflow=]
1408 | curl_msnprintf(buf, sizeof(buf), "%*f", INT_MIN, 9.1);
| ^~~
lib557.c:1408:3: note: ‘curl_msnprintf’ output 2147483649 bytes
1408 | curl_msnprintf(buf, sizeof(buf), "%*f", INT_MIN, 9.1);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
Ref: https://app.circleci.com/pipelines/github/curl/curl/10226/workflows/87642ee9-cda6-4916-8206-c82aac5f595e/jobs/107669?invite=true#step-106-40996_46
The root cause of why this option gets enabled remains undiscovered.
Reported-by: Daniel Stenberg
Fixes #15008
Follow-up to
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|---|---|---|
| .. | ||
| .gitignore | ||
| curl-amissl.m4 | ||
| curl-bearssl.m4 | ||
| curl-compilers.m4 | ||
| curl-confopts.m4 | ||
| curl-functions.m4 | ||
| curl-gnutls.m4 | ||
| curl-mbedtls.m4 | ||
| curl-openssl.m4 | ||
| curl-override.m4 | ||
| curl-reentrant.m4 | ||
| curl-rustls.m4 | ||
| curl-schannel.m4 | ||
| curl-sectransp.m4 | ||
| curl-sysconfig.m4 | ||
| curl-wolfssl.m4 | ||
| xc-am-iface.m4 | ||
| xc-cc-check.m4 | ||
| xc-lt-iface.m4 | ||
| xc-val-flgs.m4 | ||
| zz40-xc-ovr.m4 | ||
| zz50-xc-ovr.m4 | ||
| zz60-xc-ovr.m4 | ||