[ptxdist] /usr merge

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

I've just pushed a large series of commits for /usr merge. This means that
/bin, /sbin and /lib are now symlinks to the corresponding directories in
/usr. All files are installed accordingly.

I'm not going to rehash all the arguments for this. My main motivations
are:
- It's where the big distros are going, so it's better tested in the long
  term.
- We've had several problems in the past where programs where searched in
  the wrong location. And busybox didn't make that any easier.

How it works in PTXdist:
- install_copy and friends will transparently move files to /usr where
  appropriate. So if you have packages that install files to /bin etc. it
  should just work. If not, please sent a mail to this list.
- If install_alternative etc. installs a file from /usr/... and finds the
  a file in the corresponding path without /usr it will fail.
  This is to make sure that you move all overwrites in projectroot/.

I've done some build and runtime testing and there are currently no known
problems. But this is a big change and I can't test everything. It would be
great if some more people could test this before the next release.

Regards,
Michael

-- 
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