Fix PR libstdc++/78264

[Eric Botcazou]

As documented a few lines below in the same file (but I presume that the 
BADNAMES file is long gone), using _N wreaks havoc on Solaris:

// This marks string literals in header files to be extracted for eventual
// translation.  It is primarily used for messages in thrown exceptions; see
// src/functexcept.cc.  We use __N because the more traditional _N is used
// for something else under certain OSes (see BADNAMES).
#define __N(msgid)     (msgid)

Tested on x86-64/Linux and SPARC/Solaris, applied on mainline as obvious.


2016-12-08  Eric Botcazou  <ebotcazou@adacore.com>

	PR libstdc++/78264
	* include/bits/c++config (_GLIBCXX_NOEXCEPT_PARM): Turn _N into _NE.
	(_GLIBCXX_NOEXCEPT_QUAL): Likewise.

-- 
Eric Botcazou
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