Add a "make rpmball" target

Build a simplistic dummy package, similar to "make debball", for
developers on rpm-based systems.

[ Fixed some trailing whitespace -iwj ]

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
CC: Ian Jackson <ian.jackson@citrix.com>
CC: Ian Campbell <ian.campbell@citrix.com>
CC: Dario Faggioli <dario.faggioli@citrix.com>
CC: Olaf Hering <olaf@aepfle.de>
CC: Don Slutz <dslutz@verizon.com>
CC: M A Young <m.a.young@durham.ac.uk>
Tested-by: Don Slutz <dslutz@verizon.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

Makefile

@@ -152,6 +152,13 @@ world:
 debball: dist
 	fakeroot sh ./tools/misc/mkdeb $(XEN_ROOT) $$($(MAKE) -C xen xenversion --no-print-directory)
 
+# Package a build in an rpmball file, that is inside a .rpm format
+# container to allow for easy and clean removal. This is not intended
+# to be a full featured policy compliant .rpm package.
+.PHONY: rpmball
+rpmball: dist
+	bash ./tools/misc/mkrpm $(XEN_ROOT) $$($(MAKE) -C xen xenversion --no-print-directory)
+
 # clean doesn't do a kclean
 .PHONY: clean
 clean::