tests: use quotes when including libkeccak.h

If libkeccak is not already installed in the system, then
test.c and benchmark.c will fail to compile. This is because
they previously used `#include <libkeccak.h>` with angled brackets,
which doesn't search `.` by default. Using `#include "libkeccak.h"`
will search `.` so these will compile.

1 files changed, 1 insertions, 1 deletions

diff --git a/test.c b/test.c
index 8394568..168ced2 100644
--- a/test.c
+++ b/test.c
@@ -1,5 +1,5 @@
 /* See LICENSE file for copyright and license details. */
-#include <libkeccak.h>
+#include "libkeccak.h"
 
 #include <fcntl.h>
 #include <stdio.h>