JavaXPCOM: split MozillaInterfaces.jar into two separate libraries

Several weeks ago, I checked in the patch for 
https://bugzilla.mozilla.org/show_bug.cgi?id=328901, which splits the 
MozillaInterfaces.jar library into two separate libraries:
   (1) MozillaGlue.jar contains the main Mozilla class and all the other 
'helper' classes;
   (2) MozillaInterfaces.jar now only contains the generated Mozilla 
interfaces.

This change has only been made on the trunk (i.e. XULRunner 1.9), but I 
will probably make the same change on the 1.8 branch.

This change was made for several reasons.  For one, it provides a better 
separation of the code.  MozillaInterfaces.jar contains all of the 
generated interfaces, both frozen and unfrozen.  So particularly for 
unfrozen and new interfaces, that library is specific to a given 
release.  Whereas the classes in MozillaGlue.jar should remain mostly 
static through releases (except for new features).  That's the plan, anyway!

Secondly, this separation helps out with the Java Component Loader work 
(https://bugzilla.mozilla.org/show_bug.cgi?id=299263).  The Loader 
generates the Mozilla interfaces on the fly, so it only needs to load 
MozillaGlue.jar and can do without the much larger MozillaInterfaces.jar.


javier pedemonte