[BUG] init: unconditionally catch SIGPIPE

[BUG] init: unconditionally catch SIGPIPE

Apparently some systems define MSG_NOSIGNAL but do not necessarily
check it (or maybe binaries are built somewhere and used on older
versions). There were reports of very recent FreeBSD setups causing
SIGPIPEs, while older ones catch the signal. Recent FreeBSD manpages
indeed define MSG_NOSIGNAL.

So let's now unconditionnaly catch the signal. It's useless not to do
it for the rare cases where it's not needed (linux 2.4 and below).