ARRAYELTS → countof

C2y will standardize countof as the macro that Emacs uses the name
ARRAYELTS for.  Switch to the standard name, which is supported
by GCC 16+, by Clang 21, and by the Gnulib stdcountof-h module already
in use for compilers that do not support countof.
Also, use countof in a few places where we missed using ARRAYELTS.
* admin/coccinelle/arrayelts.cocci: Suggest countof, not ARRAYELTS.
* admin/merge-gnulib (GNULIB_MODULES): Add stdcountof-h,
as it is now a direct rather than an indirect dependency.
* exec/trace.c, src/lisp.h, src/sfnt.c: Include <stdcountof.h>.
(ARRAYELTS): Remove.  All uses replaced by countof.
* lib-src/ebrowse.c, lib-src/etags.c, lib-src/make-docfile.c:
* lib-src/seccomp-filter.c, lwlib/lwlib-Xaw.c:
Prefer <stdcountof.h> and countof to doing things by hand.

1 files changed, 3 insertions, 4 deletions

diff --git a/lwlib/lwlib-Xaw.c b/lwlib/lwlib-Xaw.c
index 0699410cc82..72e7b23c654 100644
--- a/lwlib/lwlib-Xaw.c
+++ b/lwlib/lwlib-Xaw.c
@@ -20,6 +20,7 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
+#include <stdcountof.h>
 #include <stdio.h>
 #include <setjmp.h>
 
@@ -527,11 +528,9 @@ make_dialog (char* name,
   if (! actions_initted)
     {
       XtAppContext app = XtWidgetToApplicationContext (parent);
-      XtAppAddActions (app, xaw_actions,
-		       sizeof (xaw_actions) / sizeof (xaw_actions[0]));
+      XtAppAddActions (app, xaw_actions, countof (xaw_actions));
 #if defined USE_CAIRO || defined HAVE_XFT
-      XtAppAddActions (app, button_actions,
-		       sizeof (button_actions) / sizeof (button_actions[0]));
+      XtAppAddActions (app, button_actions, countof (button_actions));
 #endif
       actions_initted = True;
     }