made changes so that start-gui.sh script can be called from anywhere and also from or with symbolic links

linuxdeploy_helper.sh

@@ -46,7 +46,9 @@ cat > $TARGET/start-gui.sh <<EOL
 export LD_LIBRARY_PATH=\`pwd\`/libs
 export QT_PLUGIN_PATH=\`pwd\`/plugins
 export QML2_IMPORT_PATH=\`pwd\`/qml
-./$GUI_EXEC
+# make it so that it can be called from anywhere and also through soft links
+SCRIPT_DIR="\$(dirname "\$(test -L "\${BASH_SOURCE[0]}" && readlink "\${BASH_SOURCE[0]}" || echo "\${BASH_SOURCE[0]}")")"
+"\$SCRIPT_DIR"/$GUI_EXEC
 EOL
 
-chmod +x $TARGET/start-gui.sh
+chmod +x $TARGET/start-gui.sh