utils: resolve compiler warnings on implicit declarations
CC osmo-auc-gen.o
osmo-auc-gen.c: In function 'main':
osmo-auc-gen.c:216:3: warning: implicit declaration of function
'time' [-Wimplicit-function-declaration]
diff --git a/utils/osmo-auc-gen.c b/utils/osmo-auc-gen.c
index fda045a..54128ff 100644
--- a/utils/osmo-auc-gen.c
+++ b/utils/osmo-auc-gen.c
@@ -25,6 +25,7 @@
#include <stdio.h>
#include <errno.h>
#include <string.h>
+#include <time.h>
#include <getopt.h>
#include <unistd.h>
#include <inttypes.h>