Get SQLite to build

* changed headers
* removed redundant declarations
* ran clang-format
* added sqlite3.mk

third_party/sqlite3/vdbevtab.c

@@ -13,9 +13,10 @@
 ** This file implements virtual-tables for examining the bytecode content
 ** of a prepared statement.
 */
-#include "sqliteInt.h"
+#include "third_party/sqlite3/sqliteInt.h"
 #if defined(SQLITE_ENABLE_BYTECODE_VTAB) && !defined(SQLITE_OMIT_VIRTUALTABLE)
-#include "vdbeInt.h"
+#include "third_party/sqlite3/vdbeInt.h"
+/* clang-format off */
 
 /* An instance of the bytecode() table-valued function.
 */