package/volk: license list is comma-separated

Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/volk/volk.mk

@@ -9,7 +9,7 @@ VOLK_SITE = https://github.com/gnuradio/volk/releases/download/v$(VOLK_VERSION)
 VOLK_SOURCE = volk-$(VOLK_VERSION).tar.xz
 # See https://github.com/gnuradio/volk/tree/v2.5.1#license for some
 # details on the licensing.
-VOLK_LICENSE = GPL-3.0+ LGPL-3.0+
+VOLK_LICENSE = GPL-3.0+, LGPL-3.0+
 VOLK_LICENSE_FILES = COPYING COPYING-LGPL
 
 VOLK_SUPPORTS_IN_SOURCE_BUILD = NO