Get SQLite to build

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

third_party/sqlite3/malloc.c

@@ -12,8 +12,9 @@
 **
 ** Memory allocation functions used throughout sqlite.
 */
-#include "sqliteInt.h"
-#include <stdarg.h>
+/* clang-format off */
+
+#include "third_party/sqlite3/sqliteInt.h"
 
 /*
 ** Attempt to release up to n bytes of non-essential memory currently