Remove use of deprecated behavior involving copy members

*  If any of the destructor, copy assignment or copy constructor
   are user-declared, both copy members should be user-declared,
   otherwise the compiler-generation of them is deprecated.

src/ripple/unity/soci.cpp

@@ -16,6 +16,12 @@
     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 //==============================================================================
+
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
+#endif
+
 #include <BeastConfig.h>
 
 // Core soci
@@ -50,3 +56,7 @@
 
 #include <core/blob.cpp>
 #include <backends/sqlite3/blob.cpp>
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif