[sql] Import reference version of SQLite 3.7.6.3.

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

 /*
 ** 2009 January 28
 **
 ** 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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   Tcl_CreateObjCommand(interp, zCmd, backupTestCmd, pBackup, backupTestFinish);
   Tcl_SetObjResult(interp, objv[1]);
   return TCL_OK;
 }
 
 int Sqlitetestbackup_Init(Tcl_Interp *interp){
   Tcl_CreateObjCommand(interp, "sqlite3_backup", backupTestInit, 0, 0);
   return TCL_OK;
 }