libraw: add license information

[Peter: also add README to _LICENSE_FILES]
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libraw/libraw.mk

@@ -7,10 +7,11 @@
 LIBRAW_VERSION = 0.13.4
 LIBRAW_SOURCE = LibRaw-$(LIBRAW_VERSION).tar.gz
 LIBRAW_SITE = http://www.libraw.org/data/
-
 LIBRAW_INSTALL_STAGING = YES
 LIBRAW_CONF_OPT += --disable-examples --disable-lcms \
 			--disable-openmp --disable-demosaic-pack-gpl2 \
 			--disable-demosaic-pack-gpl3
+LIBRAW_LICENSE = LGPLv2.1 or CDDL 1.0 or LibRaw Software License 27032010
+LIBRAW_LICENSE_FILES = LICENSE.LGPL LICENSE.CDDL LICENSE.LibRaw.pdf README
 
 $(eval $(autotools-package))