Revert D17145350
Revert D17145350

Summary:
- This should probably be set at the level of the build framework (aka getdeps or fbcode_builder) since mixing static & sharing linking is hard.
- This seems unnecessary (CI builds `oss-proxygen-darwin-getdeps` and `oss-proxygen-linux-getdeps` both pass on this diff).
- Less lines of code!

Reviewed By: lnicco

Differential Revision: D17811654

fbshipit-source-id: 0fbd41ff1e53e07b169236cff313efba8f49ff65

facebook/wangle,facebook/wangle,facebook/wangle