Makefile: install-tools does not depend on ioemu-dir if CONFIG_IOEMU=n

Based on patch by George Dunlap.

Signed-off-by: Keir Fraser <keir@xen.org>
xen-unstable changeset:   23351:0e9322ece398
xen-unstable date:        Fri May 20 08:48:33 2011 +0100

Makefile

@@ -66,9 +66,13 @@ install-xen:
 	$(MAKE) -C xen install
 
 .PHONY: install-tools
-install-tools: tools/ioemu-dir
+install-tools:
 	$(MAKE) -C tools install
 
+ifeq ($(CONFIG_IOEMU),y)
+install-tools: tools/ioemu-dir
+endif
+
 .PHONY: install-kernels
 install-kernels:
 	for i in $(XKERNELS) ; do $(MAKE) $$i-install || exit 1; done