[patch] Couple of minor tweaks to the linker testsuite

[Nick Clifton]

Hi Eric,

> 2018-09-12  Eric Botcazou  <ebotcazou@adacore.com>
> 
> ld/
> 	* testsuite/ld-elf/pr14156b.d: Adjust for extra symbols.
> 	* testsuite/ld-elf/pr22677.s: Define main/start/_start/__start.

Approved - please apply.

Cheers
  Nick