Add external/libnl and external/libnfact

Change-Id: I0668f4cd59aaaf515aebb4d83541da89194e891e
Remove external/libnl and external/nfacct

These projects weren't quite ready to be included in the manifest.
Removing for now.

Change-Id: Ica4cf732545a6a0ca64c55a4c48bdadd28637cc8
Add external/xdelta3 and external/syspatch

Change-Id: Iae76361e45720936775d16fcf674c8c89fbda6fa
Merge branch 'master' of https://android.googlesource.com/platform/manifest into default