if building Swift overlay, install into Swift toolchain dir structure #49
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Simplify the build/install logic for the Swift overlay portion of
libdispatch to assume that if the Swift overlay is being built
then the intended install target is a Swift toolchain.
In conjunction with the change to swift/utils/build-script-impl
in swiftlang/swift#1212, this change enables Swift programs compiled using
the resulting built toolchain to successfully import
Dispatch with only -Xcc -fblocks as extra arguments to swiftc
(no longer need to also specify -I).