Enable building Transformiix on Windows too (when MOZ_XSL is set). r=jag, sr=jst.

extensions/makefile.win

@@ -27,6 +27,9 @@ DIRS = wallet \
 	irc \
 !if defined(BUILD_PSM)
 	psm-glue \
+!endif 
+!if defined(MOZ_XSL)
+	transformiix \
 !endif 
 	xml-rpc \
 	xmlextras \