[PATCH] benchtests: Increase iterations for strpbrk/strspn

Increase iterations for strpbrk/strspn so they run for at least 0.5s.
Reduce iterations for the much slower wcs* variants since they take over 10s.

OK for commit?

---

diff --git a/benchtests/bench-strpbrk.c b/benchtests/bench-strpbrk.c
index 61607fde1559b24e19d0458891c3595b181986b4..139cb7d689b0db5e7b1b327355452eaa67b9ae94 100644
--- a/benchtests/bench-strpbrk.c
+++ b/benchtests/bench-strpbrk.c
@@ -48,7 +48,7 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s,
              const CHAR *rej, RES_TYPE exp_res)
 {
   RES_TYPE res = CALL (impl, s, rej);
-  size_t i, iters = INNER_LOOP_ITERS8 / CHARBYTES;
+  size_t i, iters = CHARBYTES > 1 ? INNER_LOOP_ITERS : INNER_LOOP_ITERS_LARGE;
   timing_t start, stop, cur;
 
   if (res != exp_res)
diff --git a/benchtests/bench-strspn.c b/benchtests/bench-strspn.c
index e997d443fba18382c84d1bb612b3a60dacd68f46..560bb5d77b8e9a3091a64ba5a8fa9cdd589e901a 100644
--- a/benchtests/bench-strspn.c
+++ b/benchtests/bench-strspn.c
@@ -41,7 +41,8 @@ static void
 do_one_test (json_ctx_t *json_ctx, impl_t *impl, const CHAR *s,
              const CHAR *acc, size_t exp_res)
 {
-  size_t res = CALL (impl, s, acc), i, iters = INNER_LOOP_ITERS8 / CHARBYTES;
+  size_t res = CALL (impl, s, acc), i;
+  size_t iters = CHARBYTES > 1 ? INNER_LOOP_ITERS : INNER_LOOP_ITERS_LARGE;
   timing_t start, stop, cur;
 
   if (res != exp_res)