After reviewing what you did, I'm convinced that part of it is just plain 
wrong.  You've left libGLw, libXau and libXdmcp built unshared.  These 
libraries are, like all the others, used by third party code.  They are also 
published specs.  There is no reason for them to be unshared.  Furthermore, I 
have personally seen cases where modules wanted to link with libXau and lost 
to libtool evilness.

Secondly, simply reverting to an unshared libXdmGreet does not fix the 
problem.  It has, apparently, always been broken on Alpha, and so Alpha still 
does not have a working xdm.  It should never have been built static on any 
platform, and the path should be fixed regardless.