WPACKET: don't write DER length when we don't want to
With endfirst writing, it could be that we want to abandon any zero length sub-packet. That's what WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH was supposed to make happen, but the DER length writing code didn't look at that flag. Now it does. Reviewed-by: NMatt Caswell <matt@openssl.org> Reviewed-by: NBen Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/11703)
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