Map missing ENODATA to ENOATTR to support OpenBSD's extended attribute error
reporting.

Index: source3/modules/vfs_streams_xattr.c
--- source3/modules/vfs_streams_xattr.c.orig
+++ source3/modules/vfs_streams_xattr.c
@@ -31,6 +31,10 @@
 #undef DBGC_CLASS
 #define DBGC_CLASS DBGC_VFS
 
+#ifndef ENODATA
+#define ENODATA ENOATTR
+#endif
+
 struct streams_xattr_config {
 	const char *prefix;
 	size_t prefix_len;
