Recurse into the extra tools repo the correct way from the Makefile build system. Thanks to Nick for pointing at the actual construct which should be used here.
Recurse into the extra tools repo the correct way from the Makefile
build system. Thanks to Nick for pointing at the actual construct which
should be used here.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@161609 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang