[libstdc++ PATCH] Trivial: don't use _D or _R as type names

[Doug Gregor]

The attached (trivial) patch renames the types _D to _Diff and _R to 
_Ref in bits/boost_concept_check.h. Tested on powerpc-apple-darwin6.6; 
no regressions. ext/concept_checks.cc now passes for Darwin.

Okay to commit to mainline?

	Doug

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