[Bug-stow] stow 2.3.0 external dependencies

[Adam Sampson]

Hi bug-stow,

stow 2.3.0 added external runtime dependencies on Hash::Merge and
Clone::Choose. Historically stow hasn't had runtime dependencies other
than Perl itself, which is a useful property if you're managing the
installation of Perl using stow; the bootstrapping instructions in
stow's manual would need updating to describe how to install these two
modules (and any dependencies they have now or in the future) as well.

However, Hash::Merge is much more general than stow actually needs.
I've attached a patch which replaces the merge() call with a few lines
of equivalent code -- this avoids the external dependencies, and I think
it's clearer than the merge() call.

Thanks very much,

-- 
Adam Sampson <address@hidden>                         <http://offog.org/>

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