sysctl was seriously broken.  And since in some cases 'CONFIG_SYSCTL'
could be included into application space via the kernel config option
of the same name, nasty compilation problems could result.
diff --git a/include/applets.h b/include/applets.h
index a4e78af..61210bc 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -612,7 +612,7 @@
 #ifdef CONFIG_SYNC
 	APPLET(sync, sync_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
-#ifdef CONFIG_SYSCTL
+#ifdef CONFIG_BB_SYSCTL
 	APPLET(sysctl, sysctl_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
 #endif
 #ifdef CONFIG_SYSLOGD