[arm] VxWorks target support

[Paul Brook]

The attached patch adds support for the arm-vxworks target. Mostly mechanical, 
plus some changes fixing RELA relocations.

Tested on arm-none-elf --enable-targets=all.
Ok?

Paul

2005-01-06  Paul Brook  <paul@codesourcery.com>

bfd/
 * config.bfd: Add entry for arm-*-vxworks and arm-*-windiss.
 * configure.in: Add bfd_elf32_{big,little}arm_vxworks_vec.
 * configure: Regenerate.
 * elf32-arm.c: Add VxWorks target bfd.
 (USE_REL): Remove.
 (elf32_arm_link_hash_table): Add use_rel.
 (elf32_arm_link_hash_table_create, elf32_arm_final_link_relocate,
 elf32_arm_relocate_section): Replace USE_REL with runtime check.
 Correct offset calculation for RELA case.
 (elf_backend_may_use_rel_p, elf_backend_may_use_rela_p,
 elf_backend_default_use_rela_p, elf_backend_rela_normal): Define.
 (elf32_arm_vxworks_link_hash_table_create): New function.
 * targets.c (bfd_elf32_bigarm_vxworks_vec): Add declaration.
 (bfd_elf32_littlearm_vxworks_vec): Ditto.
 (_bfd_target_vector): Add bfd_elf32_{big,little}arm_vxworks_vec.
gas/
 * config/tc-arm.c (FPU_DEFAULT): Define for TE_VXWORKS.
 (md_begin): Handle TE_VXWORKS for FP defaults.
 (md_apply_fix3): Correct rela offsets.
 (elf32_arm_target_format): Add VxWorks targets.
ld/
 * Makefie.am: Add earmelf_vxworks.
 * Makefile.in: Regenerate.
 * configure.tgt: Make arm-*-vxworks a separate case.
 * emulparams/armelf_vxworks.sh: New function.
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