host-qemu: fix install

at configure time, PREFIX is already set with $(HOST_DIR)/usr
so, don't use DESTDIR

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qemu/qemu.mk

@@ -75,7 +75,7 @@ define HOST_QEMU_BUILD_CMDS
 endef
 
 define HOST_QEMU_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(HOST_DIR) install
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
 endef
 
 $(eval $(host-generic-package))