Fix build

Author: zoewangg

core/sdk-core/src/main/java/software/amazon/awssdk/core/client/config/SdkAdvancedClientOption.java

@@ -24,7 +24,6 @@
 import software.amazon.awssdk.http.auth.spi.scheme.AuthScheme;
 import software.amazon.awssdk.http.auth.spi.scheme.AuthSchemeProvider;
 import software.amazon.awssdk.http.auth.spi.signer.HttpSigner;
-import software.amazon.awssdk.http.auth.spi.signer.SignerProperty;
 
 
 /**

core/sdk-core/src/main/java/software/amazon/awssdk/core/signer/Signer.java

@@ -17,7 +17,6 @@
 
 import software.amazon.awssdk.annotations.SdkPublicApi;
 import software.amazon.awssdk.core.CredentialType;
-import software.amazon.awssdk.core.client.builder.SdkClientBuilder;
 import software.amazon.awssdk.core.interceptor.ExecutionAttributes;
 import software.amazon.awssdk.http.SdkHttpFullRequest;
 import software.amazon.awssdk.http.auth.spi.scheme.AuthScheme;