add missing include for btrfsck.c

compiling btrfs-progs from current git I get an error in btrfsck.c about
undefined references. The attached patch adds an include for sys/stat.h
which fixes the problem for me.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/btrfsck.c b/btrfsck.c
index 6f2a0d09..d8e353e8 100644
--- a/btrfsck.c
+++ b/btrfsck.c
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
+#include <sys/stat.h>
 #include "kerncompat.h"
 #include "ctree.h"
 #include "disk-io.h"