Fix concat example in manual

[Andreas Jaeger]

David mentioned on an openSUSE mailing list the following omission, I've
committed the change below as obvious to fix it.

Andreas

2012-05-14  Andreas Jaeger  <aj@suse.de>

	* manual/string.texi (Copying and Concatenation): Add missing
	variable in concat example.
	Reported by David C. Rankin <drankinatty@suddenlinkmail.com>.

diff --git a/manual/string.texi b/manual/string.texi
index af21bcc..5051f54 100644
--- a/manual/string.texi
+++ b/manual/string.texi
@@ -886,6 +886,7 @@ concat (const char *str, @dots{})
     @{
       char *newp;
       char *wp;
+      const char *s;
 
       va_start (ap, str);
 

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