[Patch, testsuite] Require shared library support for -z {common,nocommon} tests

[Nick Clifton]

Hi Senthil,

> 2016-05-02  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>
> 
> 	* testsuite/ld-elfcomm/elfcomm.exp: Check for shared lib support.

Approved and applied.

Cheers
  Nick