fixed import warnings for stdbool on some gcc versions

Change-Id: I979a95eae70d839e20434cc7f08c196c162671a8
---
M src/tetra_llc_pdu.c
M src/tetra_llc_pdu.h
2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/src/tetra_llc_pdu.c b/src/tetra_llc_pdu.c
index d4a1eb1..dbc30f9 100644
--- a/src/tetra_llc_pdu.c
+++ b/src/tetra_llc_pdu.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <errno.h>
+#include <stdbool.h>
 
 #include <osmocom/core/utils.h>
 
diff --git a/src/tetra_llc_pdu.h b/src/tetra_llc_pdu.h
index 9b33925..ac1ae19 100644
--- a/src/tetra_llc_pdu.h
+++ b/src/tetra_llc_pdu.h
@@ -1,6 +1,8 @@
 #ifndef TETRA_LLC_PDU_H
 #define TETRA_LLC_PDU_H
 
+#include <stdbool.h>
+
 #include <osmocom/core/linuxlist.h>
 
 /* Table 21.1 */

