Fix benchtests build failure after 'add benchmark for strcoll'

This patch fixes implicit declaration of function strdup, strtok,
strcoll, strchr and removes unused variable res.

ChangeLog:

	* benchtests/bench-strcoll.c:
	Include string.h.
	(main): Remove unused variable res.

1 files changed, 1 insertions, 3 deletions

diff --git a/benchtests/bench-strcoll.c b/benchtests/bench-strcoll.c
index c3d9a08e1b..ded04a6603 100644
--- a/benchtests/bench-strcoll.c
+++ b/benchtests/bench-strcoll.c
@@ -24,6 +24,7 @@
 #include <unistd.h>
 #include "json-lib.h"
 #include "bench-timing.h"
+#include <string.h>
 
 /* Many thanks to http://generator.lorem-ipsum.info/  */
 #define INPUT_PREFIX "strcoll-inputs/"
@@ -234,9 +235,6 @@ bench_file (json_ctx_t *json_ctx, const char *testname, const char *filename,
 int
 main (void)
 {
-  timing_t res;
-  TIMING_INIT (res);
-
   json_ctx_t *json_ctx = malloc (sizeof (json_ctx_t));
   assert (json_ctx != NULL);
   json_init (json_ctx, 2, stdout);