bpf_progs: remove spurious 'btf: true' and Wall/Werror flags

as they are now (as of http://aosp/3196890 ) the default.

While at it enable -Wextra for Android BPF programs
This will help catch more errors at compile time.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I5c2ceb078449b49d04bfda7ff3bdf5e2ca25fc95
1 file changed