Revert "Codechange: Explicitly move a few variables to avoid a copy constructor (fixes warning from clang)"

This reverts commit 6378a78817.

Fixes: #521

src/3rdparty/squirrel/squirrel/sqcompiler.cpp

@@ -142,7 +142,7 @@ public:
 			break;
 		}
 		Lex();
-		return std::move(ret);
+		return ret;
 	}
 	bool IsEndOfStatement() { return ((_lex._prevtoken == '\n') || (_token == SQUIRREL_EOB) || (_token == '}') || (_token == ';')); }
 	void OptionalSemicolon()

src/3rdparty/squirrel/squirrel/sqfuncstate.cpp

@@ -503,14 +503,14 @@ SQObject SQFuncState::CreateString(const SQChar *s,SQInteger len)
 {
 	SQObjectPtr ns(SQString::Create(_sharedstate,s,len));
 	_table(_strings)->NewSlot(ns,(SQInteger)1);
-	return std::move(ns);
+	return ns;
 }
 
 SQObject SQFuncState::CreateTable()
 {
 	SQObjectPtr nt(SQTable::Create(_sharedstate,0));
 	_table(_strings)->NewSlot(nt,(SQInteger)1);
-	return std::move(nt);
+	return nt;
 }
 
 SQFunctionProto *SQFuncState::BuildProto()