Add double-conversion and LibEvent dependencies to AirStore
Add double-conversion and LibEvent dependencies to AirStore

Summary:
AIRStore OSS build have been failing with the following errors: P488300154
The issue is that two dependencies cannot be found:
-`double-conversion.h`
- `event.h`
This diff adds those dependencies to the appropriate `CMakeLists.txt` files.

Reviewed By: dgrnbrg-meta

Differential Revision: D35026232

fbshipit-source-id: 173a9f85a69579000115c3254357f0c75facea52

facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman,facebook/watchman