lttng-babeltrace: comma separate licenses

[Thomas: put between parenthesis the description of what is covered by
each license.]

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/lttng-babeltrace/lttng-babeltrace.mk

@@ -7,7 +7,7 @@
 LTTNG_BABELTRACE_SITE = http://lttng.org/files/babeltrace
 LTTNG_BABELTRACE_VERSION = 1.2.4
 LTTNG_BABELTRACE_SOURCE = babeltrace-$(LTTNG_BABELTRACE_VERSION).tar.bz2
-LTTNG_BABELTRACE_LICENSE = MIT; LGPLv2.1 for include/babeltrace/list.h; GPLv2 for test code
+LTTNG_BABELTRACE_LICENSE = MIT, LGPLv2.1 (include/babeltrace/list.h), GPLv2 (test code)
 LTTNG_BABELTRACE_LICENSE_FILES = mit-license.txt gpl-2.0.txt LICENSE
 
 LTTNG_BABELTRACE_DEPENDENCIES = popt util-linux libglib2