[ARC] General bug fixes

[ARC] General bug fixes

Fail safe for trying to reloc GOT and PLT on non dynamic linker.  Fix
issue with dynamic relocs not being generated with -pie.  Removed some
structures that were not being used.  Fixed typo changing RELENT to
RELAENT.  Fix for all SECTOFF relocations.

bfd/
2016-06-13  Cupertino Miranda  <cmiranda@synospsy.com>

	* elf32-arc.c (arc_local_data, arc_local_data): Removed.
	(SECTSTART): Changed.
	(elf_arc_relocate_section): Fixed mistake in PIE related
	condition.
	(elf_arc_size_dynamic_sections): Changed DT_RELENT to DT_RELAENT.