stpcpy is part of POSIX.1-2008 [BZ #3629]

diff --git a/ChangeLog b/ChangeLog
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+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-05-30  Roland McGrath  <roland@hack.frob.com>
+
+       [BZ #3629]
+       * manual/string.texi (Copying Strings and Arrays): stpcpy is part
+       of POSIX.1-2008.
+
 2016-05-30  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
        * sysdeps/mach/hurd/i386/____longjmp_chk.S (____longjmp_chk) [PIC]:

diff --git a/manual/string.texi b/manual/string.texi
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--- a/manual/string.texi
+++ b/manual/string.texi
@@ -612,9 +612,9 @@ and @samp{bar} to produce @samp{foobar}, which it then prints.
 @include stpcpy.c.texi
 @end smallexample
 
-This function is not part of the ISO or POSIX standards, and is not
-customary on Unix systems, but we did not invent it either.  Perhaps it
-comes from MS-DOG.
+This function is part of POSIX.1-2008 and later editions, but was
+available in @theglibc{} and other systems as an extension long before
+it was standardized.
 
 Its behavior is undefined if the strings overlap.  The function is
 declared in @file{string.h}.