qt5cinex: fix license typo

Signed-off-by: Jerzy Grzegorek <jerzy.grzegorek@trzebnica.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/qt5cinex/qt5cinex.mk

@@ -15,7 +15,7 @@ QT5CINEX_SOURCE = Qt5_CinematicExperience_$(QT5CINEX_HD)$(QT5CINEX_VERSION).tgz
 QT5CINEX_DEPENDENCIES = qt5base qt5declarative
 
 QT5CINEX_LICENSE = CC-BY-3.0
-QT5CINEX_LICENSE_FILE = README
+QT5CINEX_LICENSE_FILES = README
 
 define QT5CINEX_CONFIGURE_CMDS
 	cd $(@D); $(TARGET_MAKE_ENV) $(HOST_DIR)/usr/bin/qmake