- pull r15578 from busybox_scratch branch:

- pull r15578 from busybox_scratch branch:
  - fix bug where it would behave wrong if ./nohup.out was not writable.
  - debloat and make it readable while at it.
$ size coreutils/nohup.o*
   text    data     bss     dec     hex filename
    362       0       0     362     16a coreutils/nohup.o.trunk
    344       0       0     344     158 coreutils/nohup.o
$ make bloatcheck
function                                             old     new   delta
nohup_main                                           324     310     -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-14)             Total: -14 bytes