Linkat(2) should sanity check flags.
Linkat(2) should sanity check flags.

PiperOrigin-RevId: 224047765
Change-Id: I6f3c75b33c32bf8f8910ea3fab35406d7d672d87

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor