aya/test/cases/_lib
Dave Tucker 657fb44525 test: Add compile_c_ebpf to library
This allows for C code to be compiled and used in tests!
It does require libbpf on the host machine though...

Also moved removal of the `user` and `ebpf` dirs created by rust-script
into `lib.sh` and parameterized bits of the XDP smoke test for ease of
copying

Signed-off-by: Dave Tucker <dave@dtucker.co.uk>
..
compile-ebpf.ers test: Add compile_c_ebpf to library
lib.sh test: Add compile_c_ebpf to library