Fix wmlindent writing CRLF end of lines on windows.

Its documentation says it converts to LF. Also, my wesnoth+windows
experience says it is best to use always only LF no matter what OS.
For WML at least. And I dont wanna convert back each time.

data/tools/wmlindent

@@ -252,8 +252,8 @@ def convertor(linefilter, arglist, exclude):
                     continue
                 else:
                     try:
-                        infp = open(filename, "r")
-                        outfp = open(filename + ".out", "w")
+                        infp = open(filename, "rb")
+                        outfp = open(filename + ".out", "wb")
                         linefilter(filename, infp, outfp)
                         infp.close()
                         outfp.close()