[ARM] Fix bogus 'unresolvable R_ARM_THM_CALL' error

[Nick Clifton]

Hi Tristan,

> Sure, ok.

Thanks - I have applied the patch to the branch.

>>> bfd/
>>> 	* elf32-arm.c (elf32_arm_final_link_relocate): Mark PLT calls via
>>> 	stubs as resolved.