Update doc/common and m4

diff --git a/doc/common b/doc/common
index 92b4d40..98b7908 160000 (submodule)
--- a/doc/common
+++ b/doc/common
@@ -1 +1 @@
-Subproject commit 92b4d4032574351cda7ab8762889dea6699bff94
+Subproject commit 98b7908f8db9bcaea50b6d03e3ce2884c0350d83

diff --git a/m4 b/m4
index eda6995..a63e9ca 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit eda6995523f2412995ee60b5fe6443dee3e0d156
+Subproject commit a63e9ca4bf4ca6e78f16d58196e7b962de95a6f1