Fix cross-testing of tst-ifunc-fault-* tests

[Siddhesh Poyarekar]

On 23/01/20 5:03 am, Joseph Myers wrote:
> The tests elf/tst-ifunc-fault-bindnow and elf/tst-ifunc-fault-lazy
> fail in cross-testing because they run the dynamic linker directly
> without using the test wrapper.  This patch fixes them to use the test
> wrapper instead.
> 
> Tested that this fixes the failure of those two tests for powerpc
> soft-float.
> 

OK for master.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>