Tamir Duberstein 8c61fc9ea6
integration-test: compile C probes using build.rs
- Add libbpf as a submodule. This prevents having to plumb its location
  around (which can't be passed to Cargo build scripts) and also
  controls the version against which codegen has run.
- Move bpf written in C to the integration-test crate and define
  constants for each probe.
- Remove magic; each C source file must be directly enumerated in the
  build script and in lib.rs.
..
bpf_probe_read.rs Clippy over tests and integration-ebpf
log.rs Clippy over tests and integration-ebpf
map_test.rs Clippy over tests and integration-ebpf
name_test.rs Clippy over tests and integration-ebpf
pass.rs Clippy over tests and integration-ebpf
relocations.rs Clippy over tests and integration-ebpf
test.rs Clippy over tests and integration-ebpf