patch applied (ghc-7.0/packages/unix): Proper autoconf test for sem_close's library; fixes trac #4523

[Ian Lynagh]

Sat Jan  1 12:11:50 PST 2011  Ian Lynagh <igloo at earth.li>
  * Proper autoconf test for sem_close's library; fixes trac #4523

    M ./configure.ac -12 +3
    M ./unix.buildinfo.in -3 +1

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc-7.0/packages/unix;a=darcs_commitdiff;h=20110101201150-3fd76-05e50f38f9bda9921f371f6d0d0f91ddc659de57.gz