Add missing includes to timer_test.c and osmo-auc-gen.c
This fixes the build with -Werror-implicit-function-declaration.
taken from malformatted patch of Chí-Thanh Christopher Nguyễn <chithanh@gentoo.org>
diff --git a/utils/osmo-auc-gen.c b/utils/osmo-auc-gen.c
index 266d0d6..7a3c124 100644
--- a/utils/osmo-auc-gen.c
+++ b/utils/osmo-auc-gen.c
@@ -26,6 +26,7 @@
#include <errno.h>
#include <string.h>
#include <getopt.h>
+#include <unistd.h>
#include <osmocom/crypt/auth.h>
#include <osmocom/core/utils.h>