[ppc] Include hwcap as ifunc argument

[David Miller]

From: Richard Henderson <rth@twiddle.net>
Date: Thu, 24 May 2012 07:40:03 -0700

> On 05/21/2012 09:58 AM, Richard Henderson wrote:
>> Aside from the x86 port, there are only two targets that have ifunc
>> support in glibc mainline: ppc and arm.  It would be awesomely handy
>> if we switch these targets to mirror the sparc lead in passing along
>> the dl_hwcap contents as an argument to the resolver, *and* to do it
>> in the same release as adding getauxval.  There are some clever things
>> we can do at static link time if we know that getauxval corresponds to
>> the availability of the ifunc argument.
>>
>> Dave, dunno if you wanna change the signature of the arg from int to
>> unsigned long for 64-bit?  It just seemed prudent to do that here...
>>
>> I'll present a similar patch for arm shortly...
> 
> Like so.  Tested on armv7.  And a ping for the ppc patch?

You also have to adjust the IFUNC invocations in dl-machine.h, and
potentially elsewhere in the port.