[patch, arm] Add support for .init_array

[Paul Brook]

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?

Paul

2004-12-08  Paul Brook  <paul@codesourcery.com>

 * configure.in: Add test for .init_array.
 * configure: Regenerate.
 * newlib.hin: Add HAVE_INITFINI_ARRAY.
 * libc/misc/Makefile.am: Add init.c
 * libc/misc/Makernel.in: Regenerate.
 * libc/misc/init.c: New file.
 * libc/sys/arm/crt0.S: Call __libc_{init,fini}_array instead of
 _init/_fini if they exist.
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