scripts/package: allow custom options to rpm

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: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

scripts/package/Makefile

@@ -47,7 +47,7 @@ rpm-pkg rpm: $(objtree)/kernel.spec FORCE
 	set -e; \
 	mv -f $(objtree)/.tmp_version $(objtree)/.version
 
-	$(RPM) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
+	$(RPM) $(RPMOPTS) --target $(UTS_MACHINE) -ta ../$(KERNELPATH).tar.gz
 	rm ../$(KERNELPATH).tar.gz
 
 clean-files := $(objtree)/kernel.spec
@@ -64,7 +64,8 @@ binrpm-pkg: $(objtree)/binkernel.spec FORCE
 	set -e; \
 	mv -f $(objtree)/.tmp_version $(objtree)/.version
 
-	$(RPM) --define "_builddir $(srctree)" --target $(UTS_MACHINE) -bb $<
+	$(RPM) $(RPMOPTS) --define "_builddir $(srctree)" --target \
+		$(UTS_MACHINE) -bb $<
 
 clean-files += $(objtree)/binkernel.spec