Fix implicit __isinf declarations in exp

[Andreas Jaeger]

On 03/24/2014 11:01 PM, Joseph S. Myers wrote:
> y recent exp patch introduced warnings about implicit __isinf
> declarations in exp because e_exp.c didn't include <math.h>.  I've
> applied this patch to fix this.  Because <math.h> can't be included
> after <math_private.h> (because of macro definitions of __nan*), it
> was necessary to put an include in
> sysdeps/x86_64/fpu/multiarch/e_exp.c as well.

Thanks,
Andreas
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