libmicrohttpd: cleanup Config.in

- 'n' is default, so no need to mention it explicit
- Add homepage URL

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libmicrohttpd/Config.in

@@ -1,7 +1,8 @@
 config BR2_PACKAGE_LIBMICROHTTPD
 	bool "libmicrohttpd"
 	select BR2_PACKAGE_LIBGCRYPT
-	default n
 	help
 	  GNU libmicrohttpd is a small C library that makes it easy to
 	  run an HTTP server as part of another application.
+
+	  http://www.gnu.org/software/libmicrohttpd/