[Patch, Darwin] enable mdynamic-no-pic bootstrap for x86-darwin.

[Mike Stump]

On Nov 3, 2010, at 4:47 AM, IainS wrote:
> However, I took Paolo's observation that the plugin-supports .exp could be used as the place to deal with filtering the flag - it seems a more natural place to handle the issue.

> OK for trunk?

Ok.

Longer term, I kinda wish we had more fine grained make variables (for shared/non-shared flags)...