[lugaru] Updated Xcode project

[C.W. Betts]

The following attachment is an update to the Lugaru Xcode project in hg. It contains the following changes:
Link against system libz.
Use system GLU.
Fix compilation due to added features not added to Xcode (Stereo.cpp and Settings.cpp).
Build and link against 10.4 SDK under 32-bit code.
other minor tweaks and enhancements with the Xcode file.


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