[LTP] [PATCH] unlink09: Add _GNU_SOURCE feature macro to workaround the compile error

[Yang Xu]

In CI environment, unlink09 compiling failed on alpine/latest because loff_t
type is not declared. Add _GNU_SOURCE feature macro to enable GNU extension
to solve the problem.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
---
 testcases/kernel/syscalls/unlink/unlink09.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/testcases/kernel/syscalls/unlink/unlink09.c b/testcases/kernel/syscalls/unlink/unlink09.c
index cc4b4a07e..1472e9134 100644
--- a/testcases/kernel/syscalls/unlink/unlink09.c
+++ b/testcases/kernel/syscalls/unlink/unlink09.c
@@ -13,6 +13,8 @@
  * - EROFS when target file is on a read-only filesystem.
  */
 
+#define _GNU_SOURCE
+
 #include <sys/ioctl.h>
 #include "tst_test.h"
 #include "lapi/fs.h"
-- 
2.39.3