tslib: fix license info

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/tslib/tslib.mk

@@ -5,7 +5,7 @@
 #############################################################
 TSLIB_VERSION = 412d99d
 TSLIB_SITE = http://github.com/kergoth/tslib/tarball/master
-TSLIB_LICENSE = LGPL
+TSLIB_LICENSE = GPL, LGPL
 TSLIB_LICENSE_FILES = COPYING
 
 TSLIB_AUTORECONF = YES