Remove procfs.h inclusion

We do not use anything from this header

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
[Upstream: opsengine#110]

Author: ffainelli

src/process_iterator.c

@@ -22,9 +22,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#ifndef __APPLE__
-#include <sys/procfs.h>
-#endif
 #include <time.h>
 #include "process_iterator.h"