Fix connect(2) callers to use correct sockaddr size.

Fix connect(2) callers to use correct sockaddr size.

Some systems (eg Mac OSX 10.5) require the length passed to match
the socket address family. This introduces sys_connect() that does
the right thing, and replaces all uses oc connect(2) with sys_connect().

Note that there are some LGPL callers that still call connect(2)
directly.
(This used to be commit e1bfdc17c49da582cdf907e260301ab1946b2ed3)