Add gsmtap utility functions to libosmocore
This is imported from OsmocomBB/Layer23
diff --git a/include/osmocore/Makefile.am b/include/osmocore/Makefile.am
index fde0102..647b5c0 100644
--- a/include/osmocore/Makefile.am
+++ b/include/osmocore/Makefile.am
@@ -1,7 +1,7 @@
osmocore_HEADERS = signal.h linuxlist.h timer.h select.h msgb.h \
tlv.h bitvec.h comp128.h statistics.h gsm_utils.h utils.h \
gsmtap.h write_queue.h rsl.h gsm48.h rxlev_stat.h mncc.h \
- gsm48_ie.h logging.h gsm0808.h rate_ctr.h
+ gsm48_ie.h logging.h gsm0808.h rate_ctr.h gsmtap_util.h
if ENABLE_TALLOC
osmocore_HEADERS += talloc.h