mention prototypes more prominently in NEWS

* NEWS: Mention the function prototype issue early. (From a suggestion by Zack Weinberg.)
federicobattagliero · Mar 28, 2023 · 5ffc09f · 5ffc09f
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@@ -4,6 +4,14 @@ GNU Autoconf NEWS - User visible changes.
 
 ** Backward incompatibilities
 
+*** AC_CHECK_FUNC and similar macros now use function prototypes.
+  AC_CHECK_FUNC and and similar macros now use C declarations with
+  function prototypes, a feature introduced in C89.  The new approach
+  should work better with C23, which removed the non-prototyped K&R
+  style that AC_CHECK_FUNC previously used.  However, this change
+  means Autoconf no longer supports pre-1989 C compilers, as they do
+  not support function prototypes.
+
 *** Autoconf now requires perl 5.10 (2007) or later.
   Generated 'configure' scripts continue to run without perl.