[Rpm-maint] [PATCH] If no BuildRoot, then set a sane default.

[Bill Nottingham]

Tom 'spot' Callaway (tcallawa at redhat.com) said: 
> Feedback welcomed, as long as you don't plan on insulting me. Insulting
> the patch is ok.

Since RPM doesn't handle %{buildroot} unless 'BuildRoot:' is present in
the spec file, this won't quite work - in those cases, your temporary
buildroot will override %{buildroot} in the macro files. I'm not sure that's
what you want.

Bill