Issue #1288 - Part 1a: Update brotli to 1.0.7

This also reorganizes the exports in the build system to use `brotli/`
as include directory.

modules/brotli/enc/bit_cost.c

@@ -0,0 +1,35 @@
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Functions to estimate the bit cost of Huffman trees. */
+
+#include "./bit_cost.h"
+
+#include "../common/constants.h"
+#include "../common/platform.h"
+#include <brotli/types.h>
+#include "./fast_log.h"
+#include "./histogram.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#define FN(X) X ## Literal
+#include "./bit_cost_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+#define FN(X) X ## Command
+#include "./bit_cost_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+#define FN(X) X ## Distance
+#include "./bit_cost_inc.h"  /* NOLINT(build/include) */
+#undef FN
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}  /* extern "C" */
+#endif