selftests: openat2: Add missing dependency in Makefile

Add a dependency on header helpers.h to the main target; while at that add
to helpers.h also a missing include for bool types.

Cc: Aleksa Sarai <[e-mail]>
Signed-off-by: Cristian Marussi <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/openat2/Makefile

···
 
 include ../lib.mk
 
-$(TEST_GEN_PROGS): helpers.c
+$(TEST_GEN_PROGS): helpers.c helpers.h

tools/testing/selftests/openat2/helpers.h

···
 
 #define _GNU_SOURCE
 #include <stdint.h>
+#include <stdbool.h>
 #include <errno.h>
 #include <linux/types.h>
 #include "../kselftest.h"