common.h: Disable swap accounting in settings

There is no swap on any of our machines. Additionally, mem+swap
accounting is disabled in the default Debian kernel. We have no reason
to enable it. (It can just consume more memory.)

common.h

@@ -23,7 +23,7 @@
 
 /* Comment out if swap memory resource accounting is disabled
  * and only RAM memory should be limited. */
-#define SWAP_LIMIT 1
+//#define SWAP_LIMIT 1
 
 
 /* Other common definitions. */