New AIX libstdc++ testsuite failures

[Benjamin Kosnik]

> I attach a patch that should fix all the occurences of the reported error on 
> AIX. I've tested each modified testcase on i686-pc-linux-gnu with the 
> "#if !__GXX_WEAK__" line and the corresponding "#endif" commented out.
> 
> Could someone with access to AIX confirm that it is correct?

Huh. Interesting.

This is approved after successful AIX testing. David Edelsohn should be 
able to help.

-benjamin