[sql] Import reference version of SQLite 3.7.6.3.

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

 /*
 ** 2008 December 3
 **
 ** 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.
 **
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     if( p->v<iRowid ){
       p = p->pRight;
     }else if( p->v>iRowid ){
       p = p->pLeft;
     }else{
       return 1;
     }
   }
   return 0;
 }