vmstat: do not scale si/so just like bi/bo

Use strtoull insteadof strtoul for some counters.

A patch from Debian.

Bug-Debian: http://bugs.debian.org/558361
Bug-Debian: http://bugs.debian.org/558134
Backported-by: Sami Kerola <kerolasa@iki.fi>

proc/sysinfo.c

@@ -647,7 +647,7 @@ void meminfo(void){
     );
     head = tail+1;
     if(!found) goto nextline;
-    *(found->slot) = strtoul(head,&tail,10);
+    *(found->slot) = (unsigned long)strtoull(head,&tail,10);
 nextline:
     tail = strchr(head, '\n');
     if(!tail) break;