Get SQLite to build

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

third_party/sqlite3/where.c

@@ -16,8 +16,9 @@
 ** so is applicable.  Because this module is responsible for selecting
 ** indices, you might also think of this module as the "query optimizer".
 */
-#include "sqliteInt.h"
-#include "whereInt.h"
+#include "third_party/sqlite3/sqliteInt.h"
+#include "third_party/sqlite3/whereInt.h"
+/* clang-format off */
 
 /*
 ** Extra information appended to the end of sqlite3_index_info but not