Update macOS launcher/dependencies to latest tag.

This supports/forces the 64 bit mono runtime, and
is the first version that compiles all native code
using travis-ci.

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-20171022"
+LAUNCHER_TAG="osx-launcher-20171118"
 
 if [ $# -ne "2" ]; then
 	echo "Usage: `basename $0` tag outputdir"