A unix VFS change replaces fsync() with fstat() when using SQLITE_NO_SYNC, so

set PRAGMA synchronous=OFF in the sysfault-3 test to avoid erroneously causing
errors in xSync.

FossilOrigin-Name: 4f7f355021f9eb048fffc84e559bfb3fdb1e1e69

test/sysfault.test

@@ -226,6 +226,7 @@ do_faultsim_test 3 -faults vfsfault-* -prep {
   faultsim_delete_and_reopen
   file_control_chunksize_test db main 8192
   execsql {
+    PRAGMA synchronous=OFF;
     CREATE TABLE t1(a, b);
     BEGIN;
       SELECT * FROM t1;