Remove miscellaneous GCC >= 4.7 version conditionals

[Florian Weimer]

On 11/04/2015 10:39 PM, Joseph Myers wrote:
> Committed, in the absence of an sh maintainer and given the mechanical 
> nature of the sh changes (which in any case are just eliminating a macro I 
> added myself in 
> <https://sourceware.org/ml/libc-alpha/2011-11/msg00097.html>).

Was my observation about the ARM part incorrect?

Thanks,
Florian