split 'libosmocore' from openbsc codebase

This library is intended to collect all generic/common funcitionality
of all Osmocom.org projects, including OpenBSC but also OsmocomBB

The library currently includes the following modules:

bitvec, comp128, gsm_utils, msgb, select, signal, statistics, talloc, timer,
tlv_parse, linuxlist

msgb allocation error debugging had to be temporarily disabled as it depends on
'debug.c' functionality which at the moment remains in OpenBSC
diff --git a/openbsc/src/trau_mux.c b/openbsc/src/trau_mux.c
index 9930751..f2fa5c0 100644
--- a/openbsc/src/trau_mux.c
+++ b/openbsc/src/trau_mux.c
@@ -30,7 +30,7 @@
 #include <openbsc/subchan_demux.h>
 #include <openbsc/e1_input.h>
 #include <openbsc/debug.h>
-#include <openbsc/talloc.h>
+#include <osmocore/talloc.h>
 
 u_int8_t gsm_fr_map[] = {
 	6, 6, 5, 5, 4, 4, 3, 3,