Fix the 2 .sh scripts shebang to /bin/sh.

launch.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/sh
 
 if [ -d "$PWD/.git" ]
 then

update.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 # Use this script to Download or Update all dependances to their last
 # developpement version.
 # The dependances will be placed in the sources directory, so you do not