Revision 439547

MFH: r439356

lang/swift: update to 3.1.1

This fixes build issues [1] and makes swiftc work [2]. But swiftpm is still not
working, hopefully soon.

PR:		210284 [1]
PR:		210386 [2]
Reported by:	Lacey Powers <lacey.leanne@gmail.com> [1]
Reported by:	Tom Pusateri <pusateri@bangj.com> [2]

Approved by:	ports-secteam (swills, with-hat)