Split packages into common and version specific
* README: Update. * configure.ac: Use all packages files. * docker/appimage/build-appimage.sh (myversion): Take from downloaded file. * packages/Makefile.am (EXTRA_DIST): Add packages files * packages/packages.current: Rename to packages.common * packages/pacakges.3, packages/packages.4: New. Specific for Version 3 or 4.
This should allow us to build both the LTS Version of GnuPG
and the current version with the same build scripts so that
they are mostly in line.