[build] Move ENABLE_EXECUTE_STACK to toplevel libgcc

[Joseph S. Myers]

On Thu, 9 Jun 2011, Rainer Orth wrote:

> Indeed, that did the trick.  The following revised patch has been
> bootstrapped without regressions on i386-pc-solaris2.10.  I've already
> got build, Darwin and Mingw approval and can commit the osf and solaris
> parts on my own.  If the C parts are ok now, I suppose I still need
> approval either from the various *BSD maintainers (who haven't chimed in
> yet) of from a global reviewer?

The C parts of this version are OK.

-- 
Joseph S. Myers
joseph@codesourcery.com