fix class path if `HAXE_STD_PATH` is set (see #4163)

main.ml

@@ -1017,8 +1017,8 @@ try
 			| l ->
 				l
 		in
-		let parts = "" :: Str.split_delim (Str.regexp "[;:]") p in
-		com.class_path <- List.map normalize_path (loop parts)
+		let parts = Str.split_delim (Str.regexp "[;:]") p in
+		com.class_path <- "" :: List.map normalize_path (loop parts)
 	with
 		Not_found ->
 			if Sys.os_type = "Unix" then