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float128 in libstdc++

Our GNU libstdc++ headers enable float128 types on at least i386 and amd64.

Clang/NetBSD using libstdc++ is not prepared to use these types, it
results in build failures of popular applications like CMake.

 1. Teach Clang to use float128
[Functional and pending patch has been submitted upstream]

 2. Restrict float128 in libstdc++ to GCC (or at least disable on Clang)


#if !defined(__clang__)
/* Define if __float128 is supported on this host. */
#define _GLIBCXX_USE_FLOAT128 1

 3. Disable float128 in libstdc++ for everybody.

The first solution is being rejected by Joerg on LLVM review as there
might be incomplete support in lib[std]c++. I have no personal
preference which way to go.

Other systems go for (1.) [OpenBSD, Linux, Cygwin etc.].

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