initial checkin of osmo-remsim

This adds some initial code, particularly the ASN.1 definition of the
RSPRO protocol, related makefile to build it using ffasn1c, and our
usual autoconf infrastructure to build it.

Change-Id: Ibaa993b59e9a65a0242b0f42b27d9cd29f8e1878
diff --git a/include/Makefile.am b/include/Makefile.am
new file mode 100644
index 0000000..3578a80
--- /dev/null
+++ b/include/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = osmocom