Updated m4 and doc/common.

diff --git a/doc/common b/doc/common
index ad59063..3c4ff09 160000 (submodule)
--- a/doc/common
+++ b/doc/common
@@ -1 +1 @@
-Subproject commit ad590638ef9832806a7c1d5d996ac512160130d5
+Subproject commit 3c4ff09dc8ef24aa09fb3fad8630ec555c8e324c

diff --git a/m4 b/m4
index a3d7a33..9763824 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit a3d7a3375702caae9794ae3a724e51ae9ee46ac3
+Subproject commit 9763824ebc2240e71a2eff5bb5b3775ab56d0508