AGS: Pointers should not be casted to long

New string arithmetic is using pointers diff casted to long...
Trying to avoid C++11 features, the best option is to cast them to intptr_t instead of long

engines/ags/engine/ac/string.cpp

@@ -300,9 +300,9 @@ size_t break_up_text_into_lines(const char *todis, SplitLines &lines, int wii, i
 int MAXSTRLEN = MAX_MAXSTRLEN;
 void check_strlen(char *ptt) {
 	MAXSTRLEN = MAX_MAXSTRLEN;
-	long charstart = (long)&_GP(game).chars[0];
+	long charstart = (intptr_t)&_GP(game).chars[0];
 	long charend = charstart + sizeof(CharacterInfo) * _GP(game).numcharacters;
-	if (((long)&ptt[0] >= charstart) && ((long)&ptt[0] <= charend))
+	if (((intptr_t)&ptt[0] >= charstart) && ((intptr_t)&ptt[0] <= charend))
 		MAXSTRLEN = 30;
 }