Add missing headers

examples/pi/pi.c

@@ -15,6 +15,7 @@
  */
 
 #include "SobolQRNG/sobol.h"
+#include "SobolQRNG/sobol_gold.h"
 #include "pi.h"
 #include <sys/time.h>
 

examples/pi/pi_redux.c

@@ -17,6 +17,7 @@
 #include <starpu.h>
 #include <starpu_cuda.h>
 #include <stdlib.h>
+#include <sys/time.h>
 
 #define PI	3.14159265358979323846