[arm,patch] Prevent unwindiing off top of stack.

[Paul Brook]

The attached patch adds Arm EABI unwinding annotations to _start to prevent 
unwinding off the top of the stack if main() throws an exception.

Tested with cross to arm-none-elf and arm-none-eabi.
Ok?

Paul

2004-11-24  Paul Brook  <paul@codesourcery.com>

 * libc/sys/arm/crt0.S (_start): Add .cantunwind annotation.
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