Package mono inside the macOS app bundles.

This also removes the explicit dependency on mono's
packaged FreeType, which should allow development
builds to be used with homebrew-packaged mono.

packaging/osx/buildpackage.sh

@@ -9,7 +9,7 @@ if [[ "$OSTYPE" != "darwin"* ]]; then
 	command -v genisoimage >/dev/null 2>&1 || { echo >&2 "macOS packaging requires genisoimage."; exit 1; }
 fi
 
-LAUNCHER_TAG="osx-launcher-20171118"
+LAUNCHER_TAG="osx-launcher-20190317"
 
 if [ $# -ne "2" ]; then
 	echo "Usage: $(basename "$0") tag outputdir"