Add m4 missing files to fix build
Same files are available in other osmocom projects, otherwise configure
fails with "Please install autoconf-archive; re-run 'autoreconf -fi' for
it to take effect.".
Change-Id: Iabe3207fff8f076a3f4ddc81720bb7fdc671a46c
diff --git a/m4/README b/m4/README
new file mode 100644
index 0000000..92eb30b
--- /dev/null
+++ b/m4/README
@@ -0,0 +1,3 @@
+We want to avoid creating too many external build-time dependencies
+like this one to autoconf-archive. This directory provides a local
+copy of required m4 rules.