Add protobuf manifest

Summary: Adding protobuf manifest, which will be used to compile f4d/velox.

Reviewed By: spershin

Differential Revision: D25926384

fbshipit-source-id: 08a2dffc9e9baa0d393e5f648ce99ca032a9df5f

build/fbcode_builder/manifests/protobuf

+[manifest]
+name = protobuf
+
+[rpms]
+protobuf-devel
+
+[debs]
+libprotobuf-dev
+
+[git]
+repo_url = https://github.com/protocolbuffers/protobuf.git
+
+[build.not(os=windows)]
+builder = autoconf
+
+[build.os=windows]
+builder = nop