Avoid adding server/RequestRegistry.cpp twice in OSS build.
Avoid adding server/RequestRegistry.cpp twice in OSS build.

Summary: RequestsRegistry.cpp is added twice in lib/cpp2/CMakeLists.txt in two separate library, and we only want to link that unit for once because otherwise it will trigger the static initialization twice for the pluggable function getCurrentTick(), causing some oss builds fail to load.

Reviewed By: vitaut

Differential Revision: D26892388

fbshipit-source-id: 13a9ad20f586fc12f629e251d5e778107bdab396

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift