Mention the disable-dynloading issue

Change-Id: I6d2349b8c4d97d266faebdb630c65e0441e25b18

expat/README

@@ -36,5 +36,14 @@ libexpat in builds where that is used, why is a separate Unicode one
 needed when an internal expat is used? Good question. Next
 question. Patches welcome.
 
+Another interesting issue is the disable-dynloading case: When we link
+all needed LO code into one executable (as for iOS apps) or into one
+shared library (as in a tentative approach for Android apps) there is
+a problem with linking two libraries (ascii_expat_xmlparse and
+expat_xmlparse) that contain exactly the same symbols... Obviously
+just the one that happens to be mentioned first on the linking command
+line gets linked in, and code that then thinks it is calling the other
+one will mysteriously crash or silently fail. Working on that...
+
 From:
 [http://expat.sourceforge.net/]