- reinstated the old scriptwait implementation as a compatibility option.

Daedalus's MAP19 needs this.

src/maploader/compatibility.cpp

@@ -169,6 +169,7 @@ static FCompatOption Options[] =
 	{ "explode1",				COMPATF2_EXPLODE1, SLOT_COMPAT2 },
 	{ "explode2",				COMPATF2_EXPLODE2, SLOT_COMPAT2 },
 	{ "railing",				COMPATF2_RAILING, SLOT_COMPAT2 },
+	{ "scriptwait",				COMPATF2_SCRIPTWAIT, SLOT_COMPAT2 },
 	{ NULL, 0, 0 }
 };