Get SQLite to build

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

third_party/sqlite3/memjournal.c

@@ -23,7 +23,8 @@
 ** in the common case, they are usually small and no file I/O needs to
 ** occur.
 */
-#include "sqliteInt.h"
+#include "third_party/sqlite3/sqliteInt.h"
+/* clang-format off */
 
 /* Forward references to internal structures */
 typedef struct MemJournal MemJournal;