Can't build -CURRENT on 4.7

[David O'Brien]

On Fri, Jun 06, 2003 at 09:46:07PM -0700, Tim Kientzle wrote:
> The compiler in 4.7 does not like this:
> 
>     -std=gnu99
> 
> As a result, buildworld of -CURRENT fails
> rather early.

Committers are not required to support building 5-CURRENT, post
5.0-RELEASE on a 4.7 machine.  So this is not grounds to remove the
change.  However, someone will probably patch the build system to
tolerate it.