sys_socket tests: Improve checks for socklen_t and sa_family_t.

[Collin Funk]

Another longstanding part of the sys/socket.h specification:

    * The <sys/socket.h> header shall define the socklen_t type, which
      is an integer type of width of at least 32 bits; see APPLICATION
      USAGE.
    * The <sys/socket.h> header shall define the sa_family_t unsigned
      integer type.

On mingw I see 'typedef int socklen_t' in ws2tcpip.h. But sa_family_t is
undefined so Gnulib uses 'unsigned short' which is conforming.

I've committed a test for this to catch any other platforms. If Windows
satisfies it then hopefully nowhere else should be a problem.

Collin

0001-sys_socket-tests-Improve-checks-for-socklen_t-and-sa.patch
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