[Buildroot] [git commit master 1/1] busybox: add 1.17.0, convert to gentargets, drop 1.12, deprecate 1.13 and 1.15

[Peter Korsgaard]

commit: http://git.buildroot.net/buildroot/commit/?id=3169aae85ef4b26aec667376b0559b38582ccf52
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Closes #2167

[Peter: fix CONFIG_ID workaround for old uClibcs]
Signed-off-by: Gustavo Zacarias <gustavo at zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet at sunsite.dk>

Patch is too large, so refusing to show it