libidn: fix metadata

Signed-off-by: Kevin Tian <kevin.tian@intel.com>

meta/packages/libidn/libidn_0.5.19.bb

@@ -1,7 +1,8 @@
-LICENSE     = "LGPL"
 DESCRIPTION = "Implementation of the Stringprep, Punycode and IDNA specifications defined by the IETF Internationalized Domain Names (IDN) working group."
+HOMEPAGE = "http://www.gnu.org/software/libidn/"
 SECTION = "libs"
-PRIORITY    = "optional"
+# change to GPLv3 for >1.0 version
+LICENSE     = "LGPLv2.1+ & GPLv2+"
 PR          = "r1"
 
 inherit pkgconfig autotools gettext