stackable abilist files

[Mike Frysinger]

with ia64 being removed from the main tree, and it tweaking the abilist files 
in the past (due to it having diff symbol versioning bases), i obviously need 
to make it work with ports/.  but the abilist files don't seem to be searched 
via vpath (or i can't make it work).  i tried the obvious 
ports/sysdeps/ia64/abilist/xxx.abilist, but that didn't work.  so i brute 
forced it and created an xxx.abilist file in every dir, as well as 
abilist/xxx.abilist, but still no go -- only the toplevel abilist/xxx.abilist 
files were used.

although, for some of these (like libc.abilist), it's hard to say that forcing 
an arch to copy the entire file is a good thing considering 99% of the over 
2000 lines in there are going to be duplicate.  maybe it'd be better to let 
these particular files hold all target tuples whether they be in ports/ or the 
main tree ?

side note, seems like $(config-tls) is hardcoded to "thread" now, so the /tls 
and /notls configs were dropped from the abilist.  i see a "threads" entry, but 
i suspect it's a typo.  anybody confirm ?
-mike
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