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/vty/vty.c b/openbsc/src/vty/vty.c
index 2339bbd..1260f38 100644
--- a/openbsc/src/vty/vty.c
+++ b/openbsc/src/vty/vty.c
@@ -17,7 +17,7 @@
 #include <vty/vty.h>
 #include <vty/command.h>
 #include <vty/buffer.h>
-#include <openbsc/talloc.h>
+#include <osmocore/talloc.h>
 
 /* our callback, located in telnet_interface.c */
 void vty_event(enum event event, int sock, struct vty *vty);