Unify packages list to include all possible gnupg branches.
d2148fbe831d
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Description

Unify packages list to include all possible gnupg branches.

* packages/download.sh (usage): New options --gnupgXX.  Support
conditionals in the package list using these options.
* build.sh: Replace option --v3 by new options --gnupgXX.
* packages/packages.common: Merge GnuPG versions 2.2 and 2.4 into this
file.
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Note that we still need to sync the VSD 3.x KDE packages into
packages.common.