depends: bump protobuf to 2.6.1

Also change the download source from googlecode to github.

depends/packages/native_protobuf.mk

@@ -1,8 +1,8 @@
 package=native_protobuf
-$(package)_version=2.5.0
-$(package)_download_path=https://protobuf.googlecode.com/files
+$(package)_version=2.6.1
+$(package)_download_path=https://github.com/google/protobuf/releases/download/v$($(package)_version)
 $(package)_file_name=protobuf-$($(package)_version).tar.bz2
-$(package)_sha256_hash=13bfc5ae543cf3aa180ac2485c0bc89495e3ae711fc6fab4f8ffe90dfb4bb677
+$(package)_sha256_hash=ee445612d544d885ae240ffbcbf9267faa9f593b7b101f21d58beceb92661910
 
 define $(package)_set_vars
 $(package)_config_opts=--disable-shared