Fix compilation issue in Swift 3.1 beta 2.
Fix compilation issue in Swift 3.1 beta 2.

The requirements of @inline(__always) functions have changed slightly; they
cannot be called from internal methods anymore. This is probably a compiler
bug, but we aren’t supposed to inline stuff anyway; the __always thing is not public.

lorentey/SipHash,lorentey/SipHash,jeniffer9/SipHash,lorentey/SipHash,jeniffer9/SipHash,jeniffer9/SipHash