[IA64] add vmlinuz target

This is a trivial stand-alone patch out of the Xen/ia64 patches.  Add
a vmlinuz build target to be more compatible with x86-ish targets.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index 80ea750..21033ed 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -71,6 +71,8 @@
 
 compressed: vmlinux.gz
 
+vmlinuz: vmlinux.gz
+
 vmlinux.gz: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot) $@