CMake deb: support "python3 | python2" dependency

[Kornel Benko]

Am Mon, 19 Oct 2020 15:33:24 -0400
schrieb Scott Kostyshak <skostysh at lyx.org>:

> "make package" is convenient for making a .deb. Currently the .deb
> depends on the "python" package but in 20.04 it makes things
> complicated. Does anyone else install LyX with locally built debs?

I do regularly

> The attached patch seems to work well. Kornel, OK to commit?

Works fine here, OK

> Scott

	Kornel

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