Remove dependency to autoconf-archive

It is generally not a good idea to add more and more external
dependencies unless absolutely needed.  autoconf-archive is a good
example of that, as we need to update all build machines, and older
OpenEmbedded versions do not appear to have (the right?)
autoconf-archive recipe. Provide local copy of necessary m4 files to fix
the build there.

The dependency to autoconf-archive was introduced in Change-Id
Ied9c950dafa65f324cf31298b13b590f56139700

Change-Id: Iacc1958b471ec3fc65307259039e1d496845f528
diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 7e244bc..6d373a5 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -9,6 +9,9 @@
 AM_INIT_AUTOMAKE([dist-bzip2])
 AC_CONFIG_TESTDIR(tests)
 
+dnl FIXME: Remove this once we do not need local macro copies anymore (after upgrade to newer OE?)
+AC_CONFIG_MACRO_DIRS([m4])
+
 dnl kernel style compile messages
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])