[committed] support -shared for darwin

[Eric Christopher]

Tested by building a dylib (shared object) and diffing the verbose  
command line output with both -dynamiclib and -shared.

Committed to mainline.

-eric

2007-05-02  Eric Christopher  <echristo@apple.com>

	* config/darwin.h (TARGET_OPTION_TRANSLATE_TABLE): Translate
	-shared to -Zdynamiclib.


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