Update to latest m4 macros.

[metaproxy-moved-to-github.git] / m4

diff --git a/m4 b/m4
index 3bc5af7..28a21d8 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit 3bc5af724b370ceb2bd01fece863bd16fe7c0f6d
+Subproject commit 28a21d8b7ba5c49c640cd8d1565e4641bce72797