android: Use Android bionic's arc4random_uniform (which isn't in head…

…ers but is available on all versions so far)

Fixed crash when running program with any enums or object implementin…

…g a protocol

Simplified setup: now uses Clang from NDK and no longer needs symlink to ld

Initial release of the swiftandroid toolchain

Tag build swift-2.2-SNAPSHOT-2015-12-01-b

Tag build swift-2.2-SNAPSHOT-2015-12-01-a

OS X Test passed