updated submodules m4 and docbook

diff --git a/doc/common b/doc/common
index 00de5ca..cc59b50 160000 (submodule)
--- a/doc/common
+++ b/doc/common
@@ -1 +1 @@
-Subproject commit 00de5ca16beac9c3ac135ff92ff719b86b0c6df9
+Subproject commit cc59b50a147656750bff1385f50fd6ad656d77e4

diff --git a/m4 b/m4
index a68af87..f7d7eb4 160000 (submodule)
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit a68af871a42a363953e3ff78feff378787ad6ddd
+Subproject commit f7d7eb4b44b7fdad1942e32856d6afc2e6dcabda