Revert "Remove certs.h"

This reverts commit b8e4ae18cf24644fa8daea6add26ad33aa1e52a7.
diff --git a/programs/test/cpp_dummy_build.cpp b/programs/test/cpp_dummy_build.cpp
index 81ca32c..c71ed79 100644
--- a/programs/test/cpp_dummy_build.cpp
+++ b/programs/test/cpp_dummy_build.cpp
@@ -38,6 +38,7 @@
 #include "mbedtls/bn_mul.h"
 #include "mbedtls/camellia.h"
 #include "mbedtls/ccm.h"
+#include "mbedtls/certs.h"
 #include "mbedtls/chacha20.h"
 #include "mbedtls/chachapoly.h"
 #include "mbedtls/check_config.h"
diff --git a/programs/test/query_config.c b/programs/test/query_config.c
index b6cbb09..29d7d84 100644
--- a/programs/test/query_config.c
+++ b/programs/test/query_config.c
@@ -47,6 +47,7 @@
 #include "mbedtls/blowfish.h"
 #include "mbedtls/camellia.h"
 #include "mbedtls/ccm.h"
+#include "mbedtls/certs.h"
 #include "mbedtls/chacha20.h"
 #include "mbedtls/chachapoly.h"
 #include "mbedtls/cipher.h"