New make target: "osxpkg" to create an Mac OS X installer package.

This patch adds a new make target, "osxpkg", to the main Makefile which
gereates a Apple Mac OS X installer package of ngIRCd. The packagemaker(1)
project bundle is stored in contrib/MacOSX/ngIRCd.pmdoc.

contrib/MacOSX/postinstall.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+# ngIRCd Mac OS X postinstall/postupgrade script
+
+LDPLIST="/Library/LaunchDaemons/de.barton.ngircd.plist"
+
+if [ ! -e /etc/ngircd ]; then
+	echo "Creating symlink: /opt/ngircd/etc -> /etc/ngircd"
+	ln -s /opt/ngircd/etc /etc/ngircd || exit 1
+else
+	echo "/etc/ngircd already exists. Don't create symlink."
+fi
+
+if [ ! -e /opt/ngircd/etc/ngircd.conf ]; then
+	echo "Creating default configuration: /opt/ngircd/etc/ngircd.conf"
+	cp /opt/ngircd/share/doc/ngircd/sample-ngircd.conf \
+	 /opt/ngircd/etc/ngircd.conf || exit 1
+else
+	echo "/opt/ngircd/etc/ngircd.conf exists. Don't copy sample file."
+fi
+chmod o-rwx /opt/ngircd/etc/ngircd.conf
+
+if [ -f "$LDPLIST" ]; then
+	echo "Fixing ownership and permissions of LaunchDaemon script ..."
+	chown root:wheel "$LDPLIST" || exit 1
+	chmod 644 "$LDPLIST" || exit 1
+fi
+
+if [ -f /tmp/ngircd_needs_restart ]; then
+	echo "ngIRCd should be (re-)started ..."
+	if [ -r "$LDPLIST" ]; then
+		echo "LaunchDaemon script found, starting daemon ..."
+		launchctl load -w "$LDPLIST" || exit 1
+		echo "OK, LaunchDaemon script loaded successfully."
+	else
+		echo "LaunchDaemon script not installed. Can't start daemon."
+	fi
+else
+	echo "Not loading LaunchDaemon script."
+fi
+rm -f /tmp/ngircd_needs_restart
+
+# -eof-