Use latest libbpf
Use latest libbpf

Summary: Time to update libbpf version (the latest release is now 0.1.1).

Reviewed By: udippant

Differential Revision: D24063680

fbshipit-source-id: 715ac74e9671f0f8ed5b8fe9174fe4070fc0f991

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro