external/boringssl: bump revision.

This change bumps the BoringSSL revision to the current tip-of-tree.

Change-Id: I91d5bf467e16e8d86cb19a4de873985f524e5faa
diff --git a/src/crypto/thread_none.c b/src/crypto/thread_none.c
new file mode 100644
index 0000000..cf4e85a
--- /dev/null
+++ b/src/crypto/thread_none.c
@@ -0,0 +1,55 @@
+/* Copyright (c) 2015, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#include "internal.h"
+
+#if defined(OPENSSL_NO_THREADS)
+
+void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {}
+
+void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {}
+
+void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {}
+
+void CRYPTO_MUTEX_unlock(CRYPTO_MUTEX *lock) {}
+
+void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {}
+
+void CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX *lock) {}
+
+void CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX *lock) {}
+
+void CRYPTO_STATIC_MUTEX_unlock(struct CRYPTO_STATIC_MUTEX *lock) {}
+
+void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
+  if (*once) {
+    return;
+  }
+  *once = 1;
+  init();
+}
+
+static void *g_thread_locals[NUM_OPENSSL_THREAD_LOCALS];
+
+void *CRYPTO_get_thread_local(thread_local_data_t index) {
+  return g_thread_locals[index];
+}
+
+int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
+                            thread_local_destructor_t destructor) {
+  g_thread_locals[index] = value;
+  return 1;
+}
+
+#endif  /* OPENSSL_NO_THREADS */