Add support for statfs64.f_flags

* file.c (printstatfs64): Print f_flags if available.
diff --git a/file.c b/file.c
index 4e62c2c..473e6fd 100644
--- a/file.c
+++ b/file.c
@@ -1788,6 +1788,9 @@
 #ifdef _STATFS_F_FRSIZE
 	tprintf(", f_frsize=%llu", (unsigned long long)statbuf.f_frsize);
 #endif
+#ifdef _STATFS_F_FLAGS
+	tprintf(", f_flags=%llu", (unsigned long long)statbuf.f_flags);
+#endif
 	tprints("}");
 }