[Libreoffice] [PATCH] More cleanup in perl installer:: modules.

[Jordan Ayers]

A few more patches under fdo#39747.

#1 and #3 just remove uncalled functions (some were never used in
master, some have been unused for a few years).

#2 removes an unused data copy from a registry entry handling loop in
a function on the Windows side; it's trivial, but I haven't tested it
myself.  (I'm running on an Ubuntu system; I suppose I should be able
to build a Windows Installation package from there and then test that
file on a Windows box...  I'll try to work through that or set up a
windows build so I can run some kind of test on those modules.)

The commit comments cover where to find last use (if any) in master,
or initial commit of the code (if it was never used).

LGPLv3+ / MPL.

Jordan Ayers
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