[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/src/legacy.c

 /*
 ** 2001 September 15
 **
 ** The author disclaims copyright to this source code.  In place of
 ** a legal notice, here is a blessing:
 **
 **    May you do good and not evil.
 **    May you find forgiveness for yourself and forgive others.
 **    May you share freely, never taking more than you give.
 **
@@ skipping 124 matching lines @@
       sqlite3Error(db, SQLITE_NOMEM);
     }
   }else if( pzErrMsg ){
     *pzErrMsg = 0;
   }
 
   assert( (rc&db->errMask)==rc );
   sqlite3_mutex_leave(db->mutex);
   return rc;
 }