* stream.c (tail_strategy): Execute the strategy code also

in the case that the stream's FILE * handle is null. This handles
opening the file for the first time.
(make_stdio_stream_common): Do not use the FILE * handle if it is null.
(open_tail): Do not open the file immediately and error out.
This is undesirable because log files might not exist at the time
open_tail is called on them. Instead, produce a stream which contains
a null file handle, and use tail_strategy to poll for the file
to come into existence.

* utf8.c (w_freopen): Just in case freopen doesn't like a null
pointer for the existing stream, use fopen instead if that is the case.

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