[PATCH] add missing <stdio.h> include to unit tests for printf

[Michael Forney]

This fixes the build with --without-openssl on musl. glibc worked
previously because it got stdio.h implicitly through resolv.h.
---
 regress/unittests/kex/tests.c    | 4 ++++
 regress/unittests/sshkey/tests.c | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/regress/unittests/kex/tests.c b/regress/unittests/kex/tests.c
index a3ef19ef4..d8a38e04a 100644
--- a/regress/unittests/kex/tests.c
+++ b/regress/unittests/kex/tests.c
@@ -3,6 +3,10 @@
  * Placed in the public domain
  */
 
+#include "includes.h"
+
+#include <stdio.h>
+
 #include "../test_helper/test_helper.h"
 
 void kex_tests(void);
diff --git a/regress/unittests/sshkey/tests.c b/regress/unittests/sshkey/tests.c
index 5511e7b89..426543bd7 100644
--- a/regress/unittests/sshkey/tests.c
+++ b/regress/unittests/sshkey/tests.c
@@ -7,6 +7,8 @@
 
 #include "includes.h"
 
+#include <stdio.h>
+
 #include "../test_helper/test_helper.h"
 
 void sshkey_tests(void);
-- 
2.49.0