[PATCH] Assume that SOCK_CLOEXEC is available and works

[Florian Weimer]

This fixes (harmless, I assume) data races when accessing the various
__have_sock_cloexec variables.

Compiled and tested on x86_64-redhat-linux-gnu.  According to the
previous thread (“O_CLOEXEC and SOCK_CLOEXEC“), there might be some
impact of this change on Hurd and NaCl, but it seems manageable.

Florian
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