tests: depend on new libhexagonrpc header file

Author: flamingradian

tests/test_hexagonfs.c

@@ -20,7 +20,7 @@
  */
 
 #include <fcntl.h>
-#include <libhexagonrpc/fastrpc.h>
+#include <libhexagonrpc/hexagonrpc.h>
 #include <stdbool.h>
 #include <string.h>
 #include <unistd.h>

tests/test_iobuffer.c

@@ -19,7 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-#include <libhexagonrpc/fastrpc.h>
+#include <libhexagonrpc/hexagonrpc.h>
 #include <string.h>
 
 #include "../hexagonrpcd/iobuffer.h"