[PATCH]: beautify code in halt.c

[walter harms]

hi list,
i tried to understand the halt code and found it hard because #ifdef obvouscated
a lot of the code. I moved the wtmp stuff into its own function what made it easy
for #ifdef.

can someone take a look at the #ifdef magic for RB_HALT_SYSTEM ?
1. it seems RB_HALT is only used by netbsd.
2. init.c should have the same problem but simply defines RB_HALT_SYSTEM
    when not found.

IMHO 2. is not clever.

1. both sould use the same code (= move to platform.h) or drop it
2. init should fail. if the value for RB_HALT_SYSTEM is wrong for a system
    user will become crasy why searching the bug (and halt is not used often)


re,
  wh
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