QEMU: obsolete functions in libmath

[Scot Hetzel]

When compiling QEMU, I noticed that fabsl, remainderl, sqrtl, rintl,
lrintl, llrintl were being redefined in fpu/softfloat-native.h.
Looking for the source of this problem, I found that -CURRENT has
these defined in /usr/include/math.h and that these functions have
been implemented in FreeBSD's libm, which made them obsolete in the
../bsd/libmath.a.

Currently, there are two remaining functions that haven't been
implemented (logl and powl).

I have also notice that these patches could be removed, as they are
for FreeBSD 4.x only:

patch-fpu-softfloat-native.c
patch-libmath4

Attached is the patch which will determine what to include in libmath
for FreeBSD 5, 6, 7, and 8.

Scot
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