buildroot

network-manager: remove redundant dependencies

Now network-manager depends on glibc, there is no need anymore for the
wchar and threads dependencies (implied by glibc). So remove them.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>