add gsm_timers, for Tnnn definitions usable by FSMs

Change-Id: If212fcd042051b6fa53484254223614c5b93a9c6
diff --git a/include/osmocom/bsc/Makefile.am b/include/osmocom/bsc/Makefile.am
index 1e26c34..0f134c8 100644
--- a/include/osmocom/bsc/Makefile.am
+++ b/include/osmocom/bsc/Makefile.am
@@ -19,6 +19,7 @@
 	gsm_04_08_rr.h \
 	gsm_04_80.h \
 	gsm_data.h \
+	gsm_timers.h \
 	handover.h \
 	handover_cfg.h \
 	handover_decision.h \