[ruby/openssl] pkey: stop retrying after non-retryable error from OSSL_DECODER

Continue processing only when OSSL_DECODER_from_bio() returns the error
code ERR_R_UNSUPPORTED. Otherwise, raise an exception without retrying
decoding the input in another format.

This fixes another case where OpenSSL::PKey.read prompts for a
passphrase multiple times when the input contains multiple
passphrase-protected PEM blocks and the first one cannot be decoded.

I am not entirely sure if the error code ERR_R_UNSUPPORTED is considered
part of the public interface of OpenSSL, but this seems to be the only
option available and is the approach used internally by the
PEM_read_bio_*() functions.

Fixes https://github.com/ruby/openssl/issues/927

https://github.com/ruby/openssl/commit/985ba27d63

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