[gnutls-devel] GnuTLS | GnuTLS appects a cert with critical issuerAltName (#1163)

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GOODPWDCETCSZ created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1163



## Description of problem:
GnuTLS appects a cert with critical issuerAltName. However, OpenSSL, mbedTLS, wolfSSL, and NSS reject it. According to RFC 5280, the ext issuerAltName should be marked as non-critical.

## Version of gnutls used:

3.5.5, 3.6.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)

Ubuntu x64

## How reproducible:

Steps to Reproduce:

 * `certtool -i --infile seed-73s19-723s32 .pem`

## Actual results:
```
Chain verification output: Verified. The certificate is trusted. 
```

## Expected results:

The cert is rejected due to its critical issuerAltName.

## Attachement

[seed-73s19-723s32.zip](/uploads/3735b2a160f0ef1b93ce3cf24203660e/seed-73s19-723s32.zip)

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