[PATCH][v2] Define __CORRECT_ISO_CPP_STRING_H_PROTO correctly for Clang.

[Joseph S. Myers]

On Mon, 23 Dec 2013, Brooks Moses wrote:

> Revised to incorporate Joseph's comments about avoiding using the value 
> of possibly-undefined macros in #if conditions.
> 
> Joseph, is this version ok to commit?

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com