3rdparty: Fix Everest build to not depend on build-time macros
diff --git a/3rdparty/everest/library/Hacl_Curve25519_joined.c b/3rdparty/everest/library/Hacl_Curve25519_joined.c
new file mode 100644
index 0000000..8a764bb
--- /dev/null
+++ b/3rdparty/everest/library/Hacl_Curve25519_joined.c
@@ -0,0 +1,44 @@
+/*
+ * Interface to code from Project Everest
+ *
+ * Copyright 2016-2018 INRIA and Microsoft Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
+
+#if defined(__SIZEOF_INT128__) && (__SIZEOF_INT128__ == 16)
+#define MBEDTLS_HAVE_INT128
+#endif
+
+#if defined(MBEDTLS_HAVE_INT128)
+#include "Hacl_Curve25519.c"
+#else
+#define KRML_VERIFIED_UINT128
+#include "kremlib/FStar_UInt128_extracted.c"
+#include "legacy/Hacl_Curve25519.c"
+#endif
+
+#include "kremlib/FStar_UInt64_FStar_UInt32_FStar_UInt16_FStar_UInt8.c"
+
+#endif /* defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) */
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