restore binary mtime after debug package creation

[Alfred Landrum]

>
>If instead you want anyway the debuginfo and strip the binary but
>preserve timestamp define
>
>%global __strip strip -p # in the spec
>%__strip strip -p           #  in ~/.rpmmacros

Thank you - I just needed to additionally wrap the command in quotes as
well since it's passed to brp-strip-comment-note as an arg:

%global __strip "strip -p"


And that's working for me.