Revert "[ruby/openssl] Use EVP_Digest{Sign,Verify} when available"
This reverts commit 63f40a5be59ac898e87528630568b7890ffcf5fb.
Revert "[ruby/openssl] Use EVP_Digest{Sign,Verify} when available"
This reverts commit 63f40a5be59ac898e87528630568b7890ffcf5fb.