gnutls: report accurate error when TLS-SRP is not built-in #19365
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In these GnuTLS version the symbol-based TLS-SRP detection always succeeds. Ref: gnutls/gnutls@dab063f
``` # before: curl: (27) gnutls_srp_allocate_client_cred() failed: An unimplemented or disabled feature has been requested. # after: curl: (4) GnuTLS: TLS-SRP support not built in: An unimplemented or disabled feature has been requested. ```
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With GnuTLS 3.8.0+ the build-time SRP feature detection always succeeds.
It's also disabled by default in these GnuTLS versions.
When using TLS-SRP without it being available in GnuTLS, report
the correct error code
CURLE_NOT_BUILT_IN, replacing the out of memoryerror reported before this patch.
Also add comments to autotools and cmake scripts about this feature
detection property.
Detecting it at build-time would need to run code which doesn't work
in cross-builds. Once curl requires 3.8.0 as minimum, the build-time
checks can be deleted.
Ref: gnutls/gnutls@dab063f
Ref: gnutls/gnutls@a21e89e