busybox: create /storage/.update by default, cosmetics

Signed-off-by: Stephan Raue <stephan@openelec.tv>
wpa_supplicant: clean up config
remove bluetooth support

never worked as expected.
too much broken bt remotes, too much ps3 bd whiners
remove package: bluez
linux: remove bluetooth support
buildsys: show package name if not found

current error " no package.mk file found in " does not
give a hint what package (dependency) is missing