Fix MacOSX Xcode build for Pipe changes.
Fix MacOSX Xcode build for Pipe changes.

Also cleans up the lldb Xcode project's Source > Host > posix directory
to use group-relative file naming.  Also alphabetizes file entries.


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@219373 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb