[LTP] [PATCH v2] syscalls/xattr: fix compile when xattr.h not exist

[Caspar Z. <ca...@ca...>]

if <attr/xattr.h> doesn't exist, compliation will fail. Fix it in
autotools level.

Signed-off-by: Caspar Zhang <ca...@ca...>
---
 configure.ac                                    |    1 +
 testcases/kernel/syscalls/getxattr/getxattr01.c |   16 +++++++++++++---
 testcases/kernel/syscalls/getxattr/getxattr02.c |   17 +++++++++++++----
 testcases/kernel/syscalls/setxattr/setxattr01.c |   16 +++++++++++++---
 testcases/kernel/syscalls/setxattr/setxattr02.c |   17 +++++++++++++----
 5 files changed, 53 insertions(+), 14 deletions(-)