RFC: Testing different long double formats

[Florian Weimer]

The attached patch attempts to cover the -mlong-double-64 case.  Is this 
a direction in which we want to move?

The new test compares the 64-bit long double implementation against the 
double implementation on a few arbitrary test values, assuming that 
discrepancy due to incorrect redirection would show up very quickly.

The test needs Jakub's patch add:

   <https://sourceware.org/ml/libc-alpha/2017-08/msg01131.html>

I've tested this on ppc64 only so far.

Thanks,
Florian
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