[CMake] How to exclude empty dirs from install

[Brian Davis]

--snip--
Because if they were excluded, we would have someone on the list next
month asking why she can't create empty directories with install()
commands.
--end snip--

True point taken.  Then we would have 2 people who are correct ... Olaf and
this said hypothetic other person.   With software there is:

1) The way it should work
2) The way it was designed to work
2) The way it was documented to work
3) The way it does work

Rarely do these four things agree in software.  When they do it is only for
a brief time when it is replaced with a version that is "better" in my
experience.  These discussions are the only way to make CMake actually
better (or suck less - which is all I think any of us can hope for)... Keep
up the good work Olaf!
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