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/talloc_ctx.c b/openbsc/src/talloc_ctx.c
index 5f0ee4d..6379e13 100644
--- a/openbsc/src/talloc_ctx.c
+++ b/openbsc/src/talloc_ctx.c
@@ -1,4 +1,4 @@
-#include <openbsc/talloc.h>
+#include <osmocore/talloc.h>
 #include <openbsc/gsm_data.h>
 
 extern void *tall_msgb_ctx;