am f41c7e0b: Merge remote-tracking branch \'toybox/master\' into HEAD

* commit 'f41c7e0b78a92bf606692bba4b5b92bee359f71b':
  Add a basename_r() and use it in names_to_pid() to avoid basename() overwriting itself on some inputs. (Which makes killall really impolite. Bug report from Nicholas Noury via Elliott Hughes.)
  More explanation of TOYBOX_DEBUG for option string checking.
  Move comment about TOYBOX_DEBUG to start of file so it's more obvious.
  ifconfig MAC addresses should be lowercase.
  I added dhcpd -6 option.
  find: add -inum option
  Rename a function to be more obvious, and factor out a repeated calculation the compiler was almost certainly retaining in a register anyway.
  Promote hwclock.
  Fix hwclock -w.
  There is a typo in mkfifo.c for __Z__  option.
  Fix ionice.
  Avoid integer overflow with insane input data.
  Save failure reason for each make change .bad file.