Log Message:
Update to 2.4.2.0

changes:
2.4.2.0
 - Merge branch 'prototype' of https://github.com/tmishima/network
    * changed getPeerCred and add getPeerEid to support FreeBSD
 - Merge branch 'master' of https://github.com/neurocyte/network
    * Define SOCK_NONBLOCK if it is missing
      SOCK_NONBLOCK is not defined by Bionic libc in Android.
 - Merge branch 'master' of https://github.com/TimothyKlim/network
    * add ld options
      ability to set LDFLAGS for homebrew issue on Mac OS X
 - Fix sClose reexported as deprecated
 - Merge branch 'master' of https://github.com/hreinhardt/network
    * configure script should accept --with-gcc flag instead of --with-cc
 - Merge pull request #99 from kazu-yamamoto/stable
    * refactoring accept4.
 - Merge pull request #97 from noqqe/master
     Fix for Issue #96 (OpenBSD build error)
 - Merge pull request #101 from joeyadams/withCStringLen
    * Network.Socket: use withCStringLen instead of withCString in send and sendTo
      This fixes a bug where send and sendTo assume that `length xs` is the byte
      length of the string.  withCString(Len) produces a locale-dependent encoding,
      so this assumption may be untrue if, say, UTF-8 is used.