lttng-babeltrace: define license

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/lttng-babeltrace/lttng-babeltrace.mk

@@ -7,6 +7,8 @@
 LTTNG_BABELTRACE_SITE    = http://lttng.org/files/babeltrace/
 LTTNG_BABELTRACE_VERSION = 1.1.1
 LTTNG_BABELTRACE_SOURCE  = babeltrace-$(LTTNG_BABELTRACE_VERSION).tar.bz2
+LTTNG_BABELTRACE_LICENSE = MIT; LGPLv2 for include/babeltrace/list.h; GPLv3+ for formats/ctf/metadata/ctf-parser.h
+LTTNG_BABELTRACE_LICENSE_FILES = mit-license.txt LICENSE
 
 LTTNG_BABELTRACE_DEPENDENCIES = popt util-linux libglib2