Check if the compiler supports __attribute__.

Modifiec prot-A.txt.

ChangeLog

+Mon Jul 29 00:11:06 1996  Per Cederqvist  <ceder@lysator.liu.se>
+
+	* configure.in (HAVE_ATTRIBUTE_FORMAT_PRINTF): Define it if the
+	compiler supports the "__attribute__((format (printf, 1, 2)))"
+	construct (which is a GNU C extension).
+
+Fri Jul 26 02:51:48 1996  Per Cederqvist  <ceder@lysator.liu.se>
+
+	* doc/prot-A.txt: Documented error code 46=long-array.
+	60=find-next-text-no and 61=find-previous-text-no are recommended,
+	not experimental.
+
 Sat Jul 27 13:42:08 1996  David Byers  <davby@sen2.ida.liu.se>
 
 	* doc/Protocol-A.texi: Documented Version-Info and a few more