fbcode_builder: getdeps: fboss: add libnl manifest
fbcode_builder: getdeps: fboss: add libnl manifest

Summary:
This is towards getting open source FBOSS to build using fbcode_builder.
libnl is one of the dependencies for FBOSS. This patch adds a manifest
file to build libnl.

Reviewed By: wez

Differential Revision: D15686853

fbshipit-source-id: f7549df6dc1005630193b024be6e1ea330cc6646

wez/watchman,nodakai/watchman,wez/watchman,wez/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,facebook/watchman,wez/watchman,wez/watchman,facebook/watchman,facebook/watchman,wez/watchman,facebook/watchman,facebook/watchman,wez/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,nodakai/watchman,wez/watchman