HHH-17404 fix merge regresssion about struct support

Author: ejannett

hibernate-core/src/main/java/org/hibernate/dialect/OracleDialect.java

@@ -959,6 +959,11 @@ public boolean supportsBitType() {
 		return false;
 	}
 
+	@Override
+	public boolean supportsUserDefinedTypes() {
+		return true;
+	}
+
 	@Override
 	public String getArrayTypeName(String javaElementTypeName, String elementTypeName, Integer maxLength) {
 		return ( javaElementTypeName == null ? elementTypeName : javaElementTypeName ) + "Array";