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

am: c5d47d26b7

* commit 'c5d47d26b71a1468245e1cff372361c48928fc63':
  Use the /proc/self/fd/%d workaround for O_PATH not letting you read xattrs, inspired by: https://android-review.googlesource.com/#/c/152663/4/libc/bionic/fgetxattr.cpp
  Fix ls error message for chmod -r directories.
  Install without a mode should use 0755, and check FLAG_preserve instead of the global so "install -g 0" doesn't alias to "cp --preserve 0" and error out. through to --preserve 0"
  Replace xcount_cpus() with a call to sysconf(_SC_NPROCESSORS_CONF)
  Add xcount_cpus()
  Add comma_args() and factor out parse_o(), parse_t(), and parse_p() to use it. Fix FLAG_w.
  Factor out parse_o() and make -l -f and default output work on strings rather than bitfields.
  More ps work, and fill out remaining help text. Fix more l/r justification, implement uname vsz vsize and stat.
  Fix netstat build warnings.
  More ps work: move l/r justification to widths[], add RUID/RGID, implement PGID, plus tty detection fix from Elliott Hughes.
  fix dhcpd warning