Merge branch 'bpf-tools-makefile-improvements'

Jiri Benc says:

====================
Currently, 'make bpf' in the tools/ directory does not provide the
standard quiet output except for bpftool (which is however listed
with a wrong directory). Worse, it does not respect the build output
directory.

The 'make bpf_install' does not work as one would expect, either.
It installs unconditionally to /usr/bin without respecting DESTDIR
and prefix.

This patchset improves that behavior.
====================

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>