fix openssh macport for launchd ssh-agent usage

--- /opt/local/var/macports/sources/rsync.macports.org/release/ports/net/openssh/Portfile   2012-03-17 09:00:30.000000000 -0500
+++ openssh-Portfile    2012-03-23 13:38:10.000000000 -0500
@@ -5,7 +5,7 @@

 name            openssh
 version         5.9p1
-revision        2
+revision        3

 categories      net
 maintainers     jwa openmaintainer
@@ -42,7 +42,7 @@
 # Specified -fno-builtin because GCC 3.3 has log() as a builtin
 # (from math.h) while OpenSSH has its own log() function
 # -- from fink.
-configure.cppflags-append "-fno-builtin"
+configure.cppflags-append "-fno-builtin -D__APPLE_LAUNCHD__"
 configure.args --with-ssl-dir=${prefix} --sysconfdir=${prefix}/etc/ssh \
     --with-privsep-path=${prefix}/var/empty --with-md5-passwords \
     --with-pid-dir=${prefix}/var/run --with-tcp-wrappers \
@@ -91,6 +91,7 @@
 }

 platform darwin {
+  patchfiles-append DVG-4748610+4897588_ssh-agent_via_launchd.patch
   # create link to /usr/include/pam because 'security' was renamed to 'pam'
   # in OS X.