package/libidn/Config.in: Fix line length of text

Could not count properly.... line length > 80.

Signed-off-by: Daniel Laird <daniel.j.laird@nxp.com>

package/libidn/Config.in

@@ -2,5 +2,6 @@ config BR2_PACKAGE_LIBIDN
 	bool "libidn"
 	help
 	  http://www.gnu.org/software/libidn/
-	  Libidn's purpose is to encode and decode internationalized domain names. 
+	  Libidn's purpose is to encode and decode internationalized 
+	  domain names.