[csl-arm] Allow building arm unwind library without target headers.

[Paul Brook]

The attached patch adds a definition for abort() to unwind-arm.h. This allows 
building the unwind library without target libc headers. I've also removed a 
use of NULL from unwind-arm.c for the same reason.

Tested with cross to arm-none-eabi.
Applied to csl-arm-branch.

Paul

2004-11-19  Paul Brook  <paul@codesourcery.com>

 * unwind-arm.h: Don't include stdio.h.  Add prototype for abort().
 * config/arm/unwind-arm.c: Don't include stdio.h. Don't use NULL.
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