[PATCH] libstdc++: Don't fail if math_errhandling is not defined

[Matthias Kretz]

Tested on x86_64-linux and powerpc64le-linux. This fixes the powerpc64le-linux 
failure Jonathan reported. OK for trunk?


Older glibc does not define math_errhandling with -ffast-math, in which
case floating-point exceptions are not used.

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

libstdc++-v3/ChangeLog:

	* include/experimental/bits/simd.h (__floating_point_flags): Do
	not rely on the presence of the math_errhandling macro.
---
 libstdc++-v3/include/experimental/bits/simd.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)


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 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
 stdₓ::simd
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