Convert to SQLite amalgamation.

third_party/sqlite/src/ext/fts2/fts2.c

 /* fts2 has a design flaw which can lead to database corruption (see
 ** below).  It is recommended not to use it any longer, instead use
 ** fts3 (or higher).  If you believe that your use of fts2 is safe,
 ** add -DSQLITE_ENABLE_BROKEN_FTS2=1 to your CFLAGS.
 */
 #if (!defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS2)) \
         && !defined(SQLITE_ENABLE_BROKEN_FTS2)
 #error fts2 has a design flaw and has been deprecated.
 #endif
 /* The flaw is that fts2 uses the content table's unaliased rowid as
@@ skipping 308 matching lines @@
 #include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 
 #include "fts2.h"
 #include "fts2_hash.h"
 #include "fts2_tokenizer.h"
 #include "sqlite3.h"
-#include "sqlite3ext.h"
-SQLITE_EXTENSION_INIT1
+#ifndef SQLITE_CORE 
+# include "sqlite3ext.h"
+  SQLITE_EXTENSION_INIT1
+#endif
 
 
 /* TODO(shess) MAN, this thing needs some refactoring.  At minimum, it
 ** would be nice to order the file better, perhaps something along the
 ** lines of:
 **
 **  - utility functions
 **  - table setup functions
 **  - table update functions
 **  - table query functions
@@ skipping 6939 matching lines @@
   sqlite3 *db, 
   char **pzErrMsg,
   const sqlite3_api_routines *pApi
 ){
   SQLITE_EXTENSION_INIT2(pApi)
   return sqlite3Fts2Init(db);
 }
 #endif
 
 #endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_FTS2) */