[PATCH] bits/socket.h: Define struct sockaddr with may_alias attribute [BZ #19622]

[Florian Weimer]

It is quite common to use struct sockaddr * as an opaque, void *-like
type for socket addresses.  The POSIX API encourages to some degree.
Marek Polacek suggested to add the may_alias attribute to the definition
of struct sockaddr.

Support for that was introduced in GCC 4.0, so I added a conditional to
cdefs.h.

Florian
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