openvmtools: fix legal info

In ab71dff0 it was moved to SUBDIR, but this was never reflected for the
legal-info files, update this to fix:
http://autobuild.buildroot.net/results/836/8363943cc9c967713f585209408ea087a052a12d/

[Thomas: put OPENVMTOOLS_SUBDIR before OPENVMTOOLS_LICENSE_FILES, as
suggested by Yann.]

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: Karoly Kasza <kaszak@gmail.com>
Tested-by: Karoly Kasza <kaszak@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openvmtools/openvmtools.mk

@@ -6,11 +6,11 @@
 
 OPENVMTOOLS_VERSION = stable-9.10.0
 OPENVMTOOLS_SITE = $(call github,vmware,open-vm-tools,$(OPENVMTOOLS_VERSION))
+OPENVMTOOLS_SUBDIR = open-vm-tools
 OPENVMTOOLS_LICENSE = LGPLv2.1
-OPENVMTOOLS_LICENSE_FILES = COPYING
+OPENVMTOOLS_LICENSE_FILES = $(OPENVMTOOLS_SUBDIR)/COPYING
 # Autoreconf needed or config/missing will run configure again at buildtime
 OPENVMTOOLS_AUTORECONF = YES
-OPENVMTOOLS_SUBDIR = open-vm-tools
 OPENVMTOOLS_CONF_OPTS = --with-dnet \
 	--without-icu --without-x --without-gtk2 \
 	--without-gtkmm --without-kernel-modules \