Update m4 for boost unit test check mods

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

diff --git a/m4 b/m4
index 374a6b4..9d331ef 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit 374a6b4fe5d08e5152fd71e0803541884ea60e0f
+Subproject commit 9d331ef6b322bc17ffcd4c04728cc39b0b317e13