4.3 target deprecation patch part 1: c4x removal, whole-target deprecations

[Mark Mitchell]

Joseph S. Myers wrote:
> In view of the interest expressed in xstormy16, could a global write 
> maintainer review this patch minus the xstormy16 deprecation (I'll retest 
> for config.gcc syntax with that deprecation removed before commit)?

This patch is OK, thanks.

-- 
Mark Mitchell
CodeSourcery
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