Fixed -Wstring-plus-int related errors for compatibility with Xcode-11.4

indra/llcommon/llsdutil.cpp

@@ -332,7 +332,7 @@ struct Data
     const char* name;
 } typedata[] =
 {
-#define def(type) { LLSD::type, #type + 4 }
+#define def(type) { LLSD::type, &#type[4] }
     def(TypeUndefined),
     def(TypeBoolean),
     def(TypeInteger),

indra/newview/llcommandhandler.cpp

@@ -222,7 +222,7 @@ struct symbol_info
 
 #define ent(SYMBOL)										\
 	{													\
-		#SYMBOL + 28, /* skip "LLCommandHandler::UNTRUSTED_" prefix */	\
+		&#SYMBOL[28], /* skip "LLCommandHandler::UNTRUSTED_" prefix */	\
 		SYMBOL											\
 	}
 

indra/newview/llxmlrpclistener.cpp

@@ -100,7 +100,7 @@ class CURLcodeMapper: public StatusMapperBase<CURLcode>
     {
         // from curl.h
 // skip the "CURLE_" prefix for each of these strings
-#define def(sym) (mMap[sym] = #sym + 6)
+#define def(sym) (mMap[sym] = &#sym[6])
         def(CURLE_OK);
         def(CURLE_UNSUPPORTED_PROTOCOL);    /* 1 */
         def(CURLE_FAILED_INIT);             /* 2 */