Get SQLite to build

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

third_party/sqlite3/ctime.c

@@ -13,6 +13,7 @@
 ** This file implements routines used to report what compile-time options
 ** SQLite was built with.
 */
+/* clang-format off */
 
 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS /* IMP: R-16824-07538 */
 
@@ -21,7 +22,7 @@
 ** autoconf-based build
 */
 #if defined(_HAVE_SQLITE_CONFIG_H) && !defined(SQLITECONFIG_H)
-#include "config.h"
+#include "third_party/sqlite3/config.h"
 #define SQLITECONFIG_H 1
 #endif