Compile example failed

I want to build examples by `go build` command in docker which the docker was installed bcc
```
# github.com/iovisor/gobpf/bcc
/root/go/pkg/mod/github.com/iovisor/gobpf@v0.0.0-20180826141936-4ece6c56f936/bcc/module.go:32:10: fatal error: bcc/
bpf_common.h: No such file or directory
#include
^~~~~~~~~~~~~~~~~~
compilation terminated.
```

Start with the Docker environment and the `go build` command that produces the error, then inspect the referenced `bcc/module.go` include and how the BCC headers are made available. Done means the examples build successfully in the stated Docker setup without the missing `bcc/bpf_common.h` error.

Written by the indexing model from the issue text.