Add $FreeBSD$ so I can commit:

Remove extern int errno;.  Instead include the ANSI <errno.h>.  No
functional changes, just a higher level of pedantry.

lib/libedit/read.c

@@ -34,19 +34,21 @@
  * SUCH DAMAGE.
  */
 
-#if !defined(lint) && !defined(SCCSID)
+#if !defined(lint)
+#if 0
 static char sccsid[] = "@(#)read.c	8.1 (Berkeley) 6/4/93";
-
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
 #endif /* not lint && not SCCSID */
 /*
  * read.c: Clean this junk up! This is horrible code.
  *	   Terminal read functions
  */
 #include "sys.h"
-#include <sys/errno.h>
+#include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
-extern int errno;
 #include "el.h"
 
 #define OKCMD -1