Fix a build failure on OpenBSD 4.x.

* sysdep.c (KERN_PROC, kinfo_proc) [BSD_SYSTEM && !KERN_PROC]:
Define to KERN_PROC2 and kinfo_proc2, for OpenBSD 4.9.
list-system-processes still returns nil, but at least it doesn't crash.
Problem reported by Nelson H. F. Beebe in
<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00021.html>.

src/ChangeLog

+2013-03-05  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix a build failure on OpenBSD 4.x.
+	* sysdep.c (KERN_PROC, kinfo_proc) [BSD_SYSTEM && !KERN_PROC]:
+	Define to KERN_PROC2 and kinfo_proc2, for OpenBSD 4.9.
+	list-system-processes still returns nil, but at least it doesn't crash.
+	Problem reported by Nelson H. F. Beebe in
+	<http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00021.html>.
+
 2013-03-02  Andreas Schwab  <schwab@linux-m68k.org>
 
 	* lisp.h (XPNTR) [!USE_LSB_TAG]: Remove extra paren.  (Bug#13734)

src/sysdep.c

@@ -2649,6 +2649,13 @@ list_system_processes (void)
 
 #elif defined BSD_SYSTEM
 
+/* OpenBSD 4.9 and earlier do not have KERN_PROC.  Approximate it with
+   KERN_PROC2.  */
+# ifndef KERN_PROC
+#  define KERN_PROC KERN_PROC2
+#  define kinfo_proc kinfo_proc2
+# endif
+
 Lisp_Object
 list_system_processes (void)
 {