[ARC] Add RELOC_FOR_GLOBAL_SYMBOL in ARC target code.

This miss was identified in the context of openssh building for ARC.

bfd/ChangeLog:

    Cupertino Miranda  <cmiranda@synopsys.com>

	elf32-arc.c (elf_arc_relocate_section): Added "call" to
	RELOC_FOR_GLOBAL_SYMBOL macro.