[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/malloc.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.
 **
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   ** is unsafe, as is the call to sqlite3Error().
   */
   assert( !db || sqlite3_mutex_held(db->mutex) );
   if( db && (db->mallocFailed || rc==SQLITE_IOERR_NOMEM) ){
     sqlite3Error(db, SQLITE_NOMEM, 0);
     db->mallocFailed = 0;
     rc = SQLITE_NOMEM;
   }
   return rc & (db ? db->errMask : 0xff);
 }