Use m4 with new check for Boost libs.

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

diff --git a/m4 b/m4
index 9763824..3bc5af7 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit 9763824ebc2240e71a2eff5bb5b3775ab56d0508
+Subproject commit 3bc5af724b370ceb2bd01fece863bd16fe7c0f6d