Backport more SQLite changes to enable system-sqlite experiments.

third_party/sqlite/src/test/syscall.test

 # 2011 March 29
 #
 # 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 41 matching lines @@
 #
 do_test 2.1.1 { test_syscall exists open } 1
 do_test 2.1.2 { test_syscall exists nosuchcall } 0
 
 #-------------------------------------------------------------------------
 # Tests for the xNextSystemCall method.
 #
 foreach s {
     open close access getcwd stat fstat ftruncate
     fcntl read pread write pwrite fchmod fallocate
-    pread64 pwrite64
+    pread64 pwrite64 unlink openDirectory
 } {
   if {[test_syscall exists $s]} {lappend syscall_list $s}
 }
 do_test 3.1 { lsort [test_syscall list] } [lsort $syscall_list]
 
 #-------------------------------------------------------------------------
 # This test verifies that if a call to open() fails and errno is set to
 # EINTR, the call is retried. If it succeeds, execution continues as if
 # nothing happened. 
 #
@@ skipping 194 matching lines @@
   5  49      64 
 } {
   do_test 8.4.$tn {
     file_control_sizehint_test db main $hint
     file size test.db
   } $size
 }
 
 test_syscall reset
 finish_test