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manual: Update @standards for [__]va_copy.

There is question as to whether __va_copy should be documented in the
glibc manual at all.  Since users searching for *va_copy are likely to
find this manual, and GCC doesn't document either, it is important we
continue to provide some kind of reference.

stdarg(3) documents va_copy as being introduced in C99.

	* lang.texi (va_copy): Change standard from ISO to C99.
	(__va_copy): Add standard and header annotation.
 manual/lang.texi | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/manual/lang.texi b/manual/lang.texi
index c4b641d4e1..cf0e4e73cd 100644
--- a/manual/lang.texi
+++ b/manual/lang.texi
@@ -471,7 +471,8 @@ of the same type.
 @deftypefn {Macro} void va_copy (va_list @var{dest}, va_list @var{src})
 @deftypefnx {Macro} void __va_copy (va_list @var{dest}, va_list @var{src})
-@standardsx{va_copy, ISO, stdarg.h}
+@standardsx{va_copy, C99, stdarg.h}
+@standardsx{__va_copy, GNU, stdarg.h}
 @c This is no longer provided by glibc, but rather by the compiler.
 The @code{va_copy} macro allows copying of objects of type

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