[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/callback.c

 /*
 ** 2005 May 23 
 **
 ** 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 437 matching lines @@
     db->mallocFailed = 1;
   }else if ( 0==p->file_format ){
     sqlite3HashInit(&p->tblHash);
     sqlite3HashInit(&p->idxHash);
     sqlite3HashInit(&p->trigHash);
     sqlite3HashInit(&p->fkeyHash);
     p->enc = SQLITE_UTF8;
   }
   return p;
 }