wsapi-xavante: add LICENSE_FILES

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/wsapi-xavante/wsapi-xavante.mk

@@ -8,5 +8,6 @@ WSAPI_XAVANTE_VERSION_MAJOR = 1.6.1
 WSAPI_XAVANTE_VERSION = $(WSAPI_XAVANTE_VERSION_MAJOR)-1
 WSAPI_XAVANTE_SUBDIR = wsapi-$(WSAPI_XAVANTE_VERSION_MAJOR)
 WSAPI_XAVANTE_LICENSE = MIT
+WSAPI_XAVANTE_LICENSE_FILES = $(WSAPI_XAVANTE_SUBDIR)/doc/us/license.html
 
 $(eval $(luarocks-package))