[libc++] Patch for AIX port

[Howard Hinnant]

On Aug 14, 2013, at 3:45 AM, David Chisnall <theraven at FreeBSD.org> wrote:

>>        rm -f libc++.so
>> -        ln -s libc++.so.1 libc++.so
>> +        ln -s libc++.so.1.0 libc++.so
>>        ;;
>> esac
>> 
>> All, please examine the last line:
>> 
>> -        ln -s libc++.so.1 libc++.so
>> +        ln -s libc++.so.1.0 libc++.so
> 
> This does, however.  We don't usually use a.b version numbers.  It isn't of vital importance, however, as we don't use the upstream build system for the libc++ that we ship, although it would be mildly inconvenient for people who are building a newer version for testing.
> 
> Oh, and ln -sf is generally better than rm then ln, as it allows the operation to be atomic.

Xing, can you rework this part so that it is -ibm-only?

Howard