[current tinderbox] failure on amd64/amd64

[David Schultz]

On Fri, Jul 09, 2004, FreeBSD Tinderbox wrote:
> cc -O2 -pipe  -D_IEEE_LIBM -I/tinderbox/CURRENT/amd64/amd64/src/lib/msun/../libc/include -I/tinderbox/CURRENT/amd64/amd64/src/lib/msun/../libc/amd64  -c /tinderbox/CURRENT/amd64/amd64/src/lib/msun/src/e_scalb.c
> /tinderbox/CURRENT/amd64/amd64/src/lib/msun/src/e_scalb.c:27: error: conflicting types for `isnan'
> /tinderbox/CURRENT/amd64/amd64/src/lib/msun/src/math.h:264: error: previous declaration of `isnan'

My fault for breaking everything but i386.  (Guess what platform I
tested on.)  Now fixed.