examples/spmv/dw_block_spmv.c: include sys/time.h for gettimeofday

examples/spmv/dw_block_spmv.c

@@ -16,6 +16,7 @@
  * See the GNU Lesser General Public License in COPYING.LGPL for more details.
  */
 
+#include <sys/time.h>
 #include "dw_block_spmv.h"
 #include "matrix_market/mm_to_bcsr.h"
 #define FPRINTF(ofile, fmt, args ...) do { if (!getenv("STARPU_SSILENT")) {fprintf(ofile, fmt, ##args); }} while(0)