protobuf-c: update homepage link

Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/protobuf-c/Config.in

@@ -8,7 +8,7 @@ config BR2_PACKAGE_PROTOBUF_C
 	  Code generator and runtime libraries to use Protocol Buffers
 	  from pure C (not C++).
 
-	  http://code.google.com/p/protobuf-c/
+	  https://github.com/protobuf-c/protobuf-c
 
 comment "protobuf-c needs a toolchain w/ C++, threads"
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS