squashfs: add xattr support configure option

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c
index 32f5b54..7a9464d 100644
--- a/fs/squashfs/namei.c
+++ b/fs/squashfs/namei.c
@@ -63,6 +63,7 @@
 #include "squashfs_fs_sb.h"
 #include "squashfs_fs_i.h"
 #include "squashfs.h"
+#include "xattr.h"
 
 /*
  * Lookup name in the directory index, returning the location of the metadata