Add quick script to automate Mac dmg creation

This basically automates what is documented in the README

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

packaging/macosx/make-package.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# this simply automates the steps to create a DMG we can ship
+# for this to work you need to have a custom build of MacPorts / gtk / etc
+# with prefix=/Applications/Subsurface.app/Contents/Resources
+# yes, that's a major hack, but otherwise gettext cannot seem to find
+# the gtk related .mo files and localization is only partial
+#
+# run this from the packaging/macosx directory
+
+VERSION=`grep -1 CFBundleVersionString Info.plist | tail -1 | cut -d\> -f 2 | cut -d\< -f 1`
+BUNDLER="../../../.local/bin/gtk-mac-bundler"
+
+${BUNDLER} subsurface.bundle
+cd staging/Subsurface.app/Contents
+for i in Resources/lib/gdk-pixbuf-2.0/2.10.0/loaders/* ; do
+	~/gtk-mac-bundler/bundler/run-install-name-tool-change.sh $i /Applications/Subsurface.app/Contents/Resources Resources change ;
+done
+for i in Resources/lib/*.dylib;
+do
+	install_name_tool -id "@executable_path/../$i" $i
+done
+
+cd ../../..
+if [ -f Subsurface-${VERSION}.dmg ]; then
+	mv Subsurface-${VERSION}.dmg Subsurface-${VERSION}.dmg.bak
+fi
+hdiutil create -volname Subsurface -srcfolder staging Subsurface-${VERSION}.dmg
+