iremove ARCH warning in config.inc

src/etc/inc/config.inc

@@ -31,14 +31,12 @@
 // Set the memory limit to 128M on i386.  When someone has something like 500+ tunnels
 // the parser needs quite a bit of ram.   Do not remove this line unless you
 // know what you are doing.  If in doubt, check with dev@ _/FIRST/_!
-if(!$ARCH)
-	$ARCH = php_uname("m");
-
 // Set memory limit to 256M on amd64.
-if($ARCH == "amd64")
+if(php_uname("m") == "amd64") {
 	ini_set("memory_limit","256M");
-else
+} else {
 	ini_set("memory_limit","128M");
+}
 
 /* include globals from notices.inc /utility/XML parser files */
 require_once("notices.inc");