Use cstdint instead of inttypes.h
Use cstdint instead of inttypes.h

Summary: This is the only place `inttypes.h` is used in Folly and it's used in a context where `cstdint` would have sufficed.

Reviewed By: yfeldblum

Differential Revision: D4619248

fbshipit-source-id: e67dccb7d8bf1ad5f7539d4b039590253e8d8c79

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