Handle MSG_NOSIGNAL flag in linux_send() by setting SO_NOSIGPIPE on socket for the duration of the send() call. Such approach may be less than ideal in threading environment, when several threads share the same socket and it might happen that several of them are calling linux_send() at the same time with and without SO_NOSIGPIPE set.
Handle MSG_NOSIGNAL flag in linux_send() by setting SO_NOSIGPIPE on socket
for the duration of the send() call. Such approach may be less than ideal
in threading environment, when several threads share the same socket and it
might happen that several of them are calling linux_send() at the same time
with and without SO_NOSIGPIPE set.

However, such race condition is very unlikely in practice, therefore this
change provides practical improvement compared to the previous behaviour.

PR:		kern/76426
Submitted by:	Steven Hartland <killing@multiplay.co.uk>
MFC after:	3 days

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