[patch, arm] Add support for .init_array

[Nick Clifton]

Hi Paul,

> The Arm eabi requires the use of the .init_array section for running static 
> constructors. The attached patch implements the required startup code for 
> running these.
> 
> Tested with cross to arm-none-eabi and arm-none-elf.
> Ok?

I am not able to approve this patch, but I do have a couple of minor 
comments on it...

   * We are attempting to move the ARM startup code out of newlib and 
into libgloss, so your patch to libc/sys/arm/crt0.S ought to be 
duplicated in libgloss/arm.crt0.S

   * It is normally OK to omit a patch to auto-generated files (eg 
newlib/configure, libc/misc/Makernel.in) and instead rely upon the 
committer to make sure that such files are regenerated.

   * In my opinion new source files such as libc/misc/init.c ought to 
include a copyright notice at the start.  I know that other source files 
in the misc/ directory do not have this, so this is just a suggestion.

Cheers
   Nick