[PATCH v3 35/68] selftests/move_mount_set_group: Drop define _GNU_SOURCE

_GNU_SOURCE is provided by lib.mk, so it should be dropped to prevent
redefinition warnings.

Fixes: 809216233555 ("selftests/harness: remove use of LINE_MAX")
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Muhammad Usama Anjum <redacted>
Signed-off-by: Edward Liaw <redacted>
---
 .../selftests/move_mount_set_group/move_mount_set_group_test.c   | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/testing/selftests/move_mount_set_group/move_mount_set_group_test.c b/tools/testing/selftests/move_mount_set_group/move_mount_set_group_test.c
index bcf51d785a37..bd975670f61d 100644
--- a/tools/testing/selftests/move_mount_set_group/move_mount_set_group_test.c
+++ b/tools/testing/selftests/move_mount_set_group/move_mount_set_group_test.c

@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE
 #include <sched.h>
 #include <stdio.h>
 #include <errno.h>

-- 
2.45.0.118.g7fe29c98d7-goog