[PATCH v5] Implement the ability to set/unset environment variables to GDBserver when starting the inferior

[Eli Zaretskii]

> From: Sergio Durigan Junior <sergiodj@redhat.com>
> Cc: Pedro Alves <palves@redhat.com>,	Simon Marchi <simon.marchi@polymtl.ca>,	Sergio Durigan Junior <sergiodj@redhat.com>
> Date: Thu, 31 Aug 2017 16:49:32 -0400
> 
> Changes from v4:
> 
> - Applied Simon's patch to refactor the unittest.  Thanks, Simon!

OK for the documentation parts.

Thanks.