Merge changes Ie1705960,I8b94351f,I661540a9,Id2dbdcab,I1223578c, ...

* changes:
  Merge remote-tracking branch 'toybox/master' into HEAD
  Decode netlink sockets in lsof.
  New command: flock.
  Fix bug in od that screwed up position indicator on arm and mips.
  Fix allnoconfig. (Exporting HOSTCC before HOSTCC?=cc caused a problem.)
  Export makefile variables so you can say "make CROSS_COMPILE=blah-" as well as "CROSS_COMPILE=blah- make".
  Minor cleanup and add "MODALIAS" handler (suggested by Isaac Dunham).
  Back to chipping away at ps...
  Add uClinux analysis to roadmap, and a few other pending changes.
  help_exit() tweak.
  xvfork went away.
  Make defconfig build for nommu.
  Another chunk of nommu support, replacing toys.recursion with toys.stacktop.
  xexec() is noreturn.
  Add xvfork() as a static inline and use it from various places.
  The -o /dev/null trick in probing isn't compatible with elf2flt, so use tempfile.
  Fix a couple things gcc is too dumb to figure out on its own.
  Add find tests.