check RSA key size for PSS#10866
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Description
Don't select RSA-PSS in MatchSigAlgo when the RSA key is too small for the signature.
When a TLS 1.2 server holds a small RSA certificate (e.g. 512bit) and the ClientHello's signature_algorithms extension offers rsa_pss_rsae_sha256 (0x0804), the handshake is aborted even though the client also offers rsa_pkcs1_sha256 (0x0401), which the key can use.
Fixes zd#22091
Testing
Local test with 512bit cert and run time SetMinRsaKey_Sz.
Checklist