gstutils: Add special random unit test for 64 scaling functions

This tests 100000 random multiplications/divisions of all scaling
function variants and compares the result with the result that is
generated by GMP on the same input.

For this check for GSL and GMP during configure but only use
it for this single unit test.

Testing functions were provided by Kipp Cannon <kcannon@ligo.caltech.edu>

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