swig: comma separate licenses

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

package/swig/swig.mk

@@ -12,7 +12,7 @@ HOST_SWIG_CONF_OPTS = \
 	--without-pcre \
 	--disable-ccache \
 	--without-octave
-SWIG_LICENSE = GPLv3+ BSD-2c BSD-3c
+SWIG_LICENSE = GPLv3+, BSD-2c, BSD-3c
 SWIG_LICENSE_FILES = LICENSE LICENSE-GPL LICENSE-UNIVERSITIES
 
 # CMake looks first at swig3.0, then swig2.0 and then swig. However,