[m-rev.] for review: Add option --no-default-runtime-library-directory.

[Julien Fischer]

On Thu, 31 Mar 2016, Peter Wang wrote:

> Add an option to prevent the compiler adding any directories to the
> runtime search path automatically.  The user can set the entire RPATH
> using --runtime-library-directory or leave it empty, without any
> defaults from the compiler.
>
> compiler/options.m:
> compiler/handle_options.m:
> doc/user_guide.texi:
> NEWS:
> 	  As above.

That's fine.

Julien.