I suggest you either fix the epatch line or copy or create that patch for the new version.
*** Bug 294873 has been marked as a duplicate of this bug. ***
I'm going to guess it's actually supposed to be "protobuf-2.2.0-decoder_test_64bit_fix.patch", which exists. I bet it'll work fine if you change epatch "${FILESDIR}/${P}-decoder_test_64bit_fix.patch" epatch "${FILESDIR}/${P}-fix-emacs-byte-compile.patch" to epatch "${FILESDIR}/protobuf-2.2.0-decoder_test_64bit_fix.patch" epatch "${FILESDIR}/protobuf-2.2.0-fix-emacs-byte-compile.patch"
Fixed: 2.2.0a is using 2.2.0 patches.