Fix 'hides overloaded virtual function' error

Author: sbaluja

src/aws-cpp-sdk-core/include/smithy/client/common/AwsSmithyRequestSigning.h

@@ -281,7 +281,7 @@ namespace smithy
                                           false/*retryable*/));
               return;
             }
-            result.emplace(signer->sign(m_message, m_seed, *static_cast<IdentityT*>(m_requestContext->m_awsIdentity.get()),
+            result.emplace(signer->signMessage(m_message, m_seed, *static_cast<IdentityT*>(m_requestContext->m_awsIdentity.get()),
                   m_requestContext->m_authSchemeOption.signerProperties()));
           }
       };

src/aws-cpp-sdk-core/include/smithy/identity/signer/AwsSignerBase.h

@@ -49,7 +49,7 @@ namespace smithy {
         // signer may copy the original httpRequest or create a new one
         virtual SigningFutureOutcome sign(std::shared_ptr<HttpRequest> httpRequest, const IdentityT& identity, SigningProperties properties) = 0;
         virtual SigningFutureOutcome presign(std::shared_ptr<HttpRequest> httpRequest, const IdentityT& identity, SigningProperties properties, const Aws::String& region, const Aws::String& serviceName, long long expirationTimeInSeconds) = 0;
-        virtual SigningEventOutcome sign(Aws::Utils::Event::Message&, Aws::String&, const IdentityT&, SigningProperties) { return SigningError(Aws::Client::CoreErrors::CLIENT_SIGNING_FAILURE, "", "Failed to sign with a signer that doesn't support signing event messages", false /*retryable*/); };
+        virtual SigningEventOutcome signMessage(Aws::Utils::Event::Message&, Aws::String&, const IdentityT&, SigningProperties) { return SigningError(Aws::Client::CoreErrors::CLIENT_SIGNING_FAILURE, "", "Failed to sign with a signer that doesn't support signing event messages", false /*retryable*/); };
 
         virtual ~AwsSignerBase() {};
     };

src/aws-cpp-sdk-core/include/smithy/identity/signer/built-in/SigV4Signer.h

@@ -95,7 +95,7 @@ namespace smithy {
                                           false /*retryable*/));
         }
 
-        SigningEventOutcome sign(Aws::Utils::Event::Message& msg, Aws::String& seed, const AwsCredentialIdentityBase& identity, SigningProperties properties) override {
+        SigningEventOutcome signMessage(Aws::Utils::Event::Message& msg, Aws::String& seed, const AwsCredentialIdentityBase& identity, SigningProperties properties) override {
           AWS_UNREFERENCED_PARAM(properties);
           const auto legacyCreds = [&identity]() -> Aws::Auth::AWSCredentials {
             if(identity.sessionToken().has_value() && identity.expiration().has_value())