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/bsc_init.c b/openbsc/src/bsc_init.c
index 617d4ae..57fc4b3 100644
--- a/openbsc/src/bsc_init.c
+++ b/openbsc/src/bsc_init.c
@@ -21,7 +21,7 @@
  */
 
 #include <openbsc/gsm_data.h>
-#include <openbsc/gsm_utils.h>
+#include <osmocore/gsm_utils.h>
 #include <openbsc/gsm_04_08.h>
 #include <openbsc/abis_rsl.h>
 #include <openbsc/abis_nm.h>
@@ -31,7 +31,7 @@
 #include <openbsc/system_information.h>
 #include <openbsc/paging.h>
 #include <openbsc/signal.h>
-#include <openbsc/talloc.h>
+#include <osmocore/talloc.h>
 
 /* global pointer to the gsm network data structure */
 extern struct gsm_network *bsc_gsmnet;