pgbouncer - pgbouncer: Build fixes for Solaris * Use __func__ and

Log Message:
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Build fixes for Solaris

* Use __func__ and define it to __FUNCTION__ if not defined.
  it's the C99 standard.

* Tests for certain linking libraries (libnsl, libsocket, libresolv) (configure.ac)

* Defines INADDR_NONE  if not defined

* Search for <ucred.h> in addition to <sys/ucred.h> (configure.ac)

* Changes include of <sys/errno.h> to <errno.h>.
  I _think_ this should be safe on all platforms (and it's the standard)

* Changes local variable name s_addr to saddr in takeover.c.
  s_addr is a Single Unix Specification defined name.

* Checks if LOG_AUTHPRIV exists (it does not in Solaris)

Original patch by Magne Mæhre, applied with minor changes

Modified Files:
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    pgbouncer:
        configure.ac (r1.32 -> r1.33)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/configure.ac.diff?r1=1.32&r2=1.33)
    pgbouncer/include:
        system.h (r1.12 -> r1.13)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/include/system.h.diff?r1=1.12&r2=1.13)
        util.h (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/include/util.h.diff?r1=1.6&r2=1.7)
    pgbouncer/src:
        system.c (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/system.c.diff?r1=1.3&r2=1.4)
        takeover.c (r1.13 -> r1.14)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/takeover.c.diff?r1=1.13&r2=1.14)
        util.c (r1.23 -> r1.24)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/util.c.diff?r1=1.23&r2=1.24)