libuci: update legal info

CLI tool and lua bindings are released under GPLv2.

Reviewed-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
[Thomas: use proper construct to concatenate new licenses to
<pkg>_LICENSE, as suggested by Yann E. Morin.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libuci/libuci.mk

@@ -6,7 +6,7 @@
 
 LIBUCI_VERSION = e339407372ffc70b1451e4eda218c01aa95a6a7f
 LIBUCI_SITE = git://nbd.name/uci.git
-LIBUCI_LICENSE = LGPLv2.1
+LIBUCI_LICENSE = LGPLv2.1, GPLv2 (tools)
 LIBUCI_INSTALL_STAGING = YES
 LIBUCI_DEPENDENCIES = libubox
 
@@ -15,6 +15,7 @@ LIBUCI_DEPENDENCIES += lua
 LIBUCI_CONF_OPTS += -DBUILD_LUA=ON \
 	-DLUAPATH=/usr/lib/lua/5.1 \
 	-DLUA_CFLAGS=-I$(STAGING_DIR)/usr/include
+LIBUCI_LICENSE := $(LIBUCI_LICENSE), GPLv2 (lua bindings)
 else
 LIBUCI_CONF_OPTS += -DBUILD_LUA=OFF
 endif