[gnutls-devel] GnuTLS | CURVE- priority keyword doesn't work when the corresponding curve is not supported (#1473)

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Daiki Ueno created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1473



In Fedora, we remove support for small ECC curves such as P-192 or P-224 for previous legal concerns:
https://fedoraproject.org/wiki/Legal:ECC

While other curves are treated equally with both `GROUP-` and `CURVE-` priority keywords, `CURVE-` with those small curves yields a syntax error:

```console
$ gnutls-cli -l --priority NORMAL:+GROUP-SECP224R1
...
$ gnutls-cli -l --priority NORMAL:+CURVE-SECP224R1
Cipher suites for NORMAL:+CURVE-SECP224R1
Syntax error at: +CURVE-SECP224R1
$ gnutls-cli -l --priority NORMAL:+CURVE-SECP256R1
...
```

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