Fix: include version.h in ssl_test_lib.h

In development, mbedtls/version.h is getting included indirectly
in via mbedtls/build_info.h, but this doesn't happen in 2.28.
This commit add this dependency in ssl_test_lib.h

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/programs/ssl/ssl_test_lib.h b/programs/ssl/ssl_test_lib.h
index e58e2da..e02cf0a 100644
--- a/programs/ssl/ssl_test_lib.h
+++ b/programs/ssl/ssl_test_lib.h
@@ -20,6 +20,8 @@
 #ifndef MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
 #define MBEDTLS_PROGRAMS_SSL_SSL_TEST_LIB_H
 
+#include "mbedtls/version.h"
+
 #if !defined(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"
 #else