Allow building the NotificationQueue tests without event FDs
Allow building the NotificationQueue tests without event FDs

Summary:
Because event file descriptors don't exist on Windows.
This also disables the fork() test on Windows, as we don't have fork().

Reviewed By: yfeldblum

Differential Revision: D3766266

fbshipit-source-id: af8d81615957a3d7bdfcb204afbf648723921f76

Orvid/folly,rklabs/folly,Orvid/folly,Orvid/folly,rklabs/folly,rklabs/folly,floxard/folly,rklabs/folly,rklabs/folly,floxard/folly,facebook/folly,charsyam/folly,floxard/folly,charsyam/folly,facebook/folly,Orvid/folly,floxard/folly,floxard/folly,facebook/folly,facebook/folly,charsyam/folly,charsyam/folly,facebook/folly,Orvid/folly