Fix the GSL multifit 32-bit tests on x86 based on information provided at:

This problem is known upstream. See http://savannah.gnu.org/bugs/?46593

which should hopefully provide the real fix.

--- gsl-2.1/multifit/test_wnlin.c.orig 2016-01-12 08:26:06.987977367 -0800

+++ gsl-2.1/multifit/test_wnlin.c 2016-01-12 12:29:34.092460907 -0800

@@ -4,7 +4,7 @@

#define wnlin_NTRIES 1

static double wnlin_x0[wnlin_P] = { 1.0, 0.0, 0.0 };

-static double wnlin_epsrel = 1.0e-9;

+static double wnlin_epsrel = 1.0e-8;

static int wnlin_internal_weight = 1;