hoplugpath.sh: fix Makefile dependency.

In tools/hotplug/common/Makefile, install-scripts depends on genpath.
So add its dependency. Otherwise parallel build sometimes fails as
follows.

genpath and install-scripts command are being run simultaneously.
So When install-scripts tries to install it, it can be under creation.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

tools/hotplug/common/Makefile

@@ -22,7 +22,7 @@ build: genpath
 install: all install-scripts
 
 .PHONY: install-scripts
-install-scripts:
+install-scripts: build
 	[ -d $(DESTDIR)$(XEN_SCRIPT_DIR) ] || \
 		$(INSTALL_DIR) $(DESTDIR)$(XEN_SCRIPT_DIR)
 	set -e; for i in $(XEN_SCRIPTS); \