remove 2nd attempt at invoking ComSpec when spawning child

The start_child procedure is used to spawn a child process. If it fails
to launch the given argv[0] as if it were a command, it has logic to
retry using the ComSpec as a command interpreter, treating argv[0] as
a batch file name. Usually, this fails because batch files would have
been handled in the first pass if they were valid.  Also, this has
the unfortunate side effect of spawning a shell awaiting user input.

It is safer to remove this attempt.

* libguile/posix-w32.c (start_child): remove fallback processing

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