fix for Tie::File test failures on windows: the problem was

fix for Tie::File test failures on windows: the problem was
that Tie::File did not close any file handles it opens internally,
leading to file handle leaks and t/tf* temporary file littering;
we now close the handle iff Tie::File opened it

this fix unearths what appears to be a perl bug in localizing globs:
09_gen_rs.t fails due to a prematurely closed filehandle, although
it wasn't explicitly closed anywhere by the code (renaming the
*FH at line 97 to *FH1 makes it work, but I haven't done this
to allow the bug to be tracked down)

p4raw-id: //depot/perl@19498