[patch] fix PR target/43708

[IainS]

thanks to Jakub for pointing out how to solve this.
Iain.

gcc/Changelog:

2010-04-11  Iain Sandoe  <iains@gcc.gnu.org>

	PR target/43708
	* config/darwin-c.c (darwin_pragma_unused): Set DECL_READ_P
	in addition to TREE_USED, to avoid "set but unused" warnings.


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