Update m4 and doc/common.

diff --git a/doc/common b/doc/common
index ad59063..95d92dd 160000 (submodule)
--- a/doc/common
+++ b/doc/common
@@ -1 +1 @@
-Subproject commit ad590638ef9832806a7c1d5d996ac512160130d5
+Subproject commit 95d92dd6e49fe3807fd1d6c664b3883580290103

diff --git a/m4 b/m4
index a3d7a33..acee1cf 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit a3d7a3375702caae9794ae3a724e51ae9ee46ac3
+Subproject commit acee1cf4678c8c0908d65fcbc19f49c7c5aa677f