copy-file: get rid of package.

* share/txr/stdlib/copy-file.tl (package copy-file): Removed.
I cannot remember why I used this, but it was probably because
this source file was developed in "user space". Then it likely
became an experiment in the use of merge-delete-package to
define material in a temporary package which is merged down to
the ultimate target package like sys. Why get rid of this?
It's causing a problem. The second and subsequent recompile of
copy-path-rec causes its internal block not to be optimized
away. I spotted this while checking whether a recompile of the
library using the fully compiled library is different from
the initial compile: copy-path-rec's block is not optimized away.

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