Implement ECDSA_SIG_new and ECDSA_SIG_free manually.

Implement ECDSA_SIG_new and ECDSA_SIG_free manually in preparation for
removing all crypto/asn1 dependencies from ECDSA signature verification.

Change-Id: I0e84d74fa8e757af0cfb09daef03d59f428143cc
Reviewed-on: https://boringssl-review.googlesource.com/4153
Reviewed-by: Adam Langley <agl@google.com>
1 file changed