[PATCH][libcxx] Eliminate duplicate symbols against libsupc++

[Andy Gibbs]

Hi,

Using the same method as given in the commit log for r192074 (see 
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130930/090302.html), I have attached a patch that removes duplicated 
symbols in libc++ when linked against libsupc++.

I've tested building libc++ against libsupc++, libstdc++ and libc++abi without 
any obvious problems, but I wanted to see if anyone has any objections before 
I commit it.

Thanks
Andy

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