sparc64*-*-rtems* should not define __svr4__

[Eric Botcazou]

> sparc64*-*-rtems* ends up with __svr4__ defined. The attached
> patch corrects that.

Let's remove the FIXME instead.  Applied to mainline.


2013-05-14  Eric Botcazou  <ebotcazou@adacore.com>

	* config/sparc/sp64-elf.h (CPP_SUBTARGET_SPEC): Delete.
	* config/sparc/openbsd64.h (CPP_SUBTARGET_SPEC): Likewise.


-- 
Eric Botcazou
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