Use FOLLY_DEPRECATED rather than __attribute__((__deprecated__))
Use FOLLY_DEPRECATED rather than __attribute__((__deprecated__))

Summary:
Because MSVC doesn't support `__attribute__` modifiers.
Closes https://github.com/facebook/fbthrift/pull/113

Reviewed By: juchem

Differential Revision: D2853366

Pulled By: Orvid

fb-gh-sync-id: dcdb841b1c5eee6461796d81ddf3b204a2ba4450

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