gst1-plugins-base: add package license file to Makefile

Signed-off-by: W. Michael Petullo <mike@flyn.org>

multimedia/gst1-plugins-base/Makefile

@@ -12,6 +12,7 @@ PKG_VERSION:=1.2.3
 PKG_RELEASE:=1
 PKG_MAINTAINER:=W. Michael Petullo <mike@flyn.org>
 PKG_LICENSE:=LGPLv2 GPLv2
+PKG_LICENSE_FILE:=COPYING.LIB COPYING
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/gst-plugins-base-$(PKG_VERSION)
 PKG_SOURCE:=gst-plugins-base-$(PKG_VERSION).tar.xz