Build 5765
SVN-
Create GTK *_banner.c files in obj/ subfolders instead of rsrc/ so that they don't need separate cleanup rules.
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Make Objective-C code build as Objective-C++ when we build C code as C++.
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Add extra optimization defaults for OS X builds since all Intel Macs are guaranteed certain features due to the time of their debut.
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Clean up handling of architectures.