vendor libsecp256k1 so it doesn't depend on a shared library.

libsecp256k1/src/precomputed_ecmult.h

@@ -0,0 +1,38 @@
+/*****************************************************************************************************
+ * Copyright (c) 2013, 2014, 2017, 2021 Pieter Wuille, Andrew Poelstra, Jonas Nick, Russell O'Connor *
+ * Distributed under the MIT software license, see the accompanying                                  *
+ * file COPYING or https://www.opensource.org/licenses/mit-license.php.                              *
+ *****************************************************************************************************/
+
+#ifndef SECP256K1_PRECOMPUTED_ECMULT_H
+#define SECP256K1_PRECOMPUTED_ECMULT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ecmult.h"
+#include "group.h"
+#if defined(EXHAUSTIVE_TEST_ORDER)
+#    if EXHAUSTIVE_TEST_ORDER == 7
+#        define WINDOW_G 3
+#    elif EXHAUSTIVE_TEST_ORDER == 13
+#        define WINDOW_G 4
+#    elif EXHAUSTIVE_TEST_ORDER == 199
+#        define WINDOW_G 8
+#    else
+#        error No known generator for the specified exhaustive test group order.
+#    endif
+static secp256k1_ge_storage secp256k1_pre_g[ECMULT_TABLE_SIZE(WINDOW_G)];
+static secp256k1_ge_storage secp256k1_pre_g_128[ECMULT_TABLE_SIZE(WINDOW_G)];
+#else /* !defined(EXHAUSTIVE_TEST_ORDER) */
+#    define WINDOW_G ECMULT_WINDOW_SIZE
+extern const secp256k1_ge_storage secp256k1_pre_g[ECMULT_TABLE_SIZE(WINDOW_G)];
+extern const secp256k1_ge_storage secp256k1_pre_g_128[ECMULT_TABLE_SIZE(WINDOW_G)];
+#endif /* defined(EXHAUSTIVE_TEST_ORDER) */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SECP256K1_PRECOMPUTED_ECMULT_H */