Revert "Remove external/libnl and external/nfacct"

This reverts commit 55859838174254650a4d6c1284a59695e75a6b4e.
as the new projects now build.
   
Bug: 12080266

Change-Id: Icaf0980b2a1f34d9e0670426faef6bb27aca3555
1 file changed