gnu: Remove ".git" from "https://github/…/….git".

gnu: Remove ".git" from "https://github/…/….git".

Until now, 'lookup-origin' and thus 'lookup-origin-revision' in (guix
swh) would sometimes return #f for these because the ".git" URLs are
redirects to the non-".git" URLs.  Consequently, 'guix lint -c archival'
would keep saying "scheduled Software Heritage archival"; likewise, the
fallback download code would fail.

* gnu/packages/ada.scm,
gnu/packages/admin.scm,
gnu/packages/aidc.scm,
gnu/packages/algebra.scm,
gnu/packages/android.scm,
gnu/packages/animation.scm,
gnu/packages/arcan.scm,
gnu/packages/assembly.scm,
gnu/packages/audio.scm,
gnu/packages/authentication.scm,
gnu/packages/avr.scm,
gnu/packages/axoloti.scm,
gnu/packages/backup.scm,
gnu/packages/bash.scm,
gnu/packages/benchmark.scm,
gnu/packages/bioconductor.scm,
gnu/packages/bioinformatics.scm,
gnu/packages/bittorrent.scm,
gnu/packages/boost.scm,
gnu/packages/build-tools.scm,
gnu/packages/c.scm,
gnu/packages/calendar.scm,
gnu/packages/cdrom.scm,
gnu/packages/check.scm,
gnu/packages/chemistry.scm,
gnu/packages/chez.scm,
gnu/packages/clojure.scm,
gnu/packages/code.scm,
gnu/packages/compression.scm,
gnu/packages/compton.scm,
gnu/packages/coq.scm,
gnu/packages/cpp.scm,
gnu/packages/cran.scm,
gnu/packages/crypto.scm,
gnu/packages/curl.scm,
gnu/packages/databases.scm,
gnu/packages/datastructures.scm,
gnu/packages/debug.scm,
gnu/packages/disk.scm,
gnu/packages/distributed.scm,
gnu/packages/django.scm,
gnu/packages/dlang.scm,
gnu/packages/dns.scm,
gnu/packages/docker.scm,
gnu/packages/education.scm,
gnu/packages/efi.scm,
gnu/packages/elixir.scm,
gnu/packages/emacs-xyz.scm,
gnu/packages/embedded.scm,
gnu/packages/emulators.scm,
gnu/packages/engineering.scm,
gnu/packages/erlang.scm,
gnu/packages/fabric-management.scm,
gnu/packages/file-systems.scm,
gnu/packages/finance.scm,
gnu/packages/firmware.scm,
gnu/packages/flashing-tools.scm,
gnu/packages/fonts.scm,
gnu/packages/fontutils.scm,
gnu/packages/fpga.scm,
gnu/packages/game-development.scm,
gnu/packages/games.scm,
gnu/packages/genealogy.scm,
gnu/packages/genimage.scm,
gnu/packages/geo.scm,
gnu/packages/gimp.scm,
gnu/packages/gl.scm,
gnu/packages/gnome-xyz.scm,
gnu/packages/gnome.scm,
gnu/packages/gnuzilla.scm,
gnu/packages/golang.scm,
gnu/packages/gpodder.scm,
gnu/packages/graph.scm,
gnu/packages/graphics.scm,
gnu/packages/graphviz.scm,
gnu/packages/groff.scm,
gnu/packages/groovy.scm,
gnu/packages/gtk.scm,
gnu/packages/guile-xyz.scm,
gnu/packages/guile.scm,
gnu/packages/hardware.scm,
gnu/packages/haskell-apps.scm,
gnu/packages/haskell-xyz.scm,
gnu/packages/hexedit.scm,
gnu/packages/i2p.scm,
gnu/packages/ibus.scm,
gnu/packages/image-processing.scm,
gnu/packages/image-viewers.scm,
gnu/packages/image.scm,
gnu/packages/ipfs.scm,
gnu/packages/java-graphics.scm,
gnu/packages/java-maths.scm,
gnu/packages/java.scm,
gnu/packages/javascript.scm,
gnu/packages/jrnl.scm,
gnu/packages/julia.scm,
gnu/packages/jupyter.scm,
gnu/packages/kodi.scm,
gnu/packages/language.scm,
gnu/packages/lego.scm,
gnu/packages/less.scm,
gnu/packages/libusb.scm,
gnu/packages/linux.scm,
gnu/packages/lirc.scm,
gnu/packages/lisp-xyz.scm,
gnu/packages/llvm.scm,
gnu/packages/logging.scm,
gnu/packages/lolcode.scm,
gnu/packages/lua.scm,
gnu/packages/lxde.scm,
gnu/packages/lxqt.scm,
gnu/packages/machine-learning.scm,
gnu/packages/mail.scm,
gnu/packages/markup.scm,
gnu/packages/maths.scm,
gnu/packages/maven.scm,
gnu/packages/mes.scm,
gnu/packages/messaging.scm,
gnu/packages/monitoring.scm,
gnu/packages/mpd.scm,
gnu/packages/music.scm,
gnu/packages/networking.scm,
gnu/packages/node-xyz.scm,
gnu/packages/ocaml.scm,
gnu/packages/ocr.scm,
gnu/packages/onc-rpc.scm,
gnu/packages/opencl.scm,
gnu/packages/opencog.scm,
gnu/packages/pantheon.scm,
gnu/packages/password-utils.scm,
gnu/packages/patchutils.scm,
gnu/packages/pdf.scm,
gnu/packages/perl6.scm,
gnu/packages/phabricator.scm,
gnu/packages/popt.scm,
gnu/packages/printers.scm,
gnu/packages/prolog.scm,
gnu/packages/protobuf.scm,
gnu/packages/pulseaudio.scm,
gnu/packages/python-crypto.scm,
gnu/packages/python-web.scm,
gnu/packages/python-xyz.scm,
gnu/packages/qt.scm,
gnu/packages/radio.scm,
gnu/packages/rails.scm,
gnu/packages/rdf.scm,
gnu/packages/rednotebook.scm,
gnu/packages/rpc.scm,
gnu/packages/rsync.scm,
gnu/packages/ruby.scm,
gnu/packages/rust.scm,
gnu/packages/scheme.scm,
gnu/packages/screen.scm,
gnu/packages/security-token.scm,
gnu/packages/selinux.scm,
gnu/packages/serialization.scm,
gnu/packages/shells.scm,
gnu/packages/shellutils.scm,
gnu/packages/simh.scm,
gnu/packages/sml.scm,
gnu/packages/ssh.scm,
gnu/packages/statistics.scm,
gnu/packages/stenography.scm,
gnu/packages/sync.scm,
gnu/packages/syncthing.scm,
gnu/packages/synergy.scm,
gnu/packages/telephony.scm,
gnu/packages/terminals.scm,
gnu/packages/tex.scm,
gnu/packages/texinfo.scm,
gnu/packages/text-editors.scm,
gnu/packages/textutils.scm,
gnu/packages/time.scm,
gnu/packages/tmux.scm,
gnu/packages/tor.scm,
gnu/packages/toys.scm,
gnu/packages/version-control.scm,
gnu/packages/video.scm,
gnu/packages/vim.scm,
gnu/packages/virtualization.scm,
gnu/packages/vlang.scm,
gnu/packages/vnc.scm,
gnu/packages/vpn.scm,
gnu/packages/web-browsers.scm,
gnu/packages/web.scm,
gnu/packages/wireservice.scm,
gnu/packages/wm.scm,
gnu/packages/wxwidgets.scm,
gnu/packages/xdisorg.scm,
gnu/packages/xml.scm,
gnu/packages/xorg.scm,
tests/lint.scm: Remove trailing ".git" from 'git-reference' URL.