package/bustle: fix license

bustle binaries are licensed under GPL-3.0:
https://gitlab.freedesktop.org/bustle/bustle/-/blob/bustle-0.7.5/LICENSE

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/bustle/bustle.mk

@@ -6,7 +6,7 @@
 
 BUSTLE_VERSION = 0.7.5
 BUSTLE_SITE = https://www.freedesktop.org/software/bustle/$(BUSTLE_VERSION)
-BUSTLE_LICENSE = LGPL-2.1+
+BUSTLE_LICENSE = LGPL-2.1+, GPL-3.0 (binaries)
 BUSTLE_LICENSE_FILES = LICENSE
 BUSTLE_DEPENDENCIES = libglib2 libpcap host-pkgconf