Remove uClibc-ng patch as it's not in the tree anymore.

Also remove the _GNU_SOURCE CFLAG for the same reason.

Refreshed patches.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Bidirectional Forwarding Detection (BFD) is a network protocol that is used to
detect faults between two forwarding engines connected by a link.

Signed-off-by: Lucian Cristian <lucian.cristian@gmail.com>