Add a RPMOPTS make variable to allow arbitrary options to be passed
to rpm during 'make rpm-pkg'. For example:

 make RPMOPTS="--define '_topdir /home/jk/rpm'" rpm-pkg
Signed-off-by: NJeremy Kerr <jk@ozlabs.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>