Update all sources from freedesktop.org to use https

* gnu/packages/xorg.scm:
* gnu/packages/xdisorg.scm:
* gnu/packages/video.scm:
* gnu/packages/tls.scm:
* gnu/packages/python.scm:
* gnu/packages/pulseaudio.scm:
* gnu/packages/polkit.scm:
* gnu/packages/pdf.scm:
* gnu/packages/libcanberra.scm:
* gnu/packages/gtk.scm:
* gnu/packages/gstreamer.scm:
* gnu/packages/gnome.scm:
* gnu/packages/glib.scm:
* gnu/packages/ghostscript.scm:
* gnu/packages/freedesktop.scm:
* gnu/packages/fontutils.scm: Update all sources hosted on freedesktop
  to fetch tarballs via https.  freedesktop.org appears to have updated
  recently to redirect all http to https.  As an exception, we leave
  pkg-config like it is, because pkg-config is needed to build gnutls,
  and without gnutls we can't download https URLs.

gnu: wayland: Build documentation.

* gnu/packages/freedesktop.scm (wayland)[native-inputs]: Add graphviz.

gnu: elogind: Use 'shepherd' input.

* gnu/packages/freedesktop.scm (elogind)[inputs]: Replace 'dmd' with
  'shepherd'.

Merge branch 'master' into core-updates

gnu: Add colord-gtk.

* gnu/packages/freedesktop.scm (colord-gtk): New variable.

gnu: Add telepathy-logger.

* gnu/packages/freedesktop.scm (telepathy-logger): New variable.

gnu: Add modem-manager.

* gnu/packages/freedesktop.scm (modem-manager): New variable.

gnu: Add libqmi.

* gnu/packages/freedesktop.scm (libqmi): New variable.

gnu: Add libmbim.

* gnu/packages/freedesktop.scm (libmbim): New variable.

Merge branch 'master' into core-updates

gnu: wayland: Update to 1.9.0.

* gnu/packages/freedesktop.scm (wayland): Update to 1.9.0.

gnu: udisks: Separate HTML documentation.

* gnu/packages/freedesktop.scm (udisks)[outputs]: New field.
  [arguments]: Pass the --with-html-dir configure flag.

gnu: udisks: Mount things under /media.

* gnu/packages/freedesktop.scm (udisks)[arguments]: Add
  --enable-fhs-media.

gnu: udisks: Find the 'mount' command.

* gnu/packages/freedesktop.scm (udisks)[inputs]: Add UTIL-LINUX.
  [arguments]: Add 'set-mount-file-name' phase.

Merge branch 'dbus-update'

Merge branch 'master' into dbus-update

gnu: elogind: Provide the file name of 'halt' and 'reboot'.

* gnu/packages/freedesktop.scm (elogind)[inputs]: Add DMD.

gnu: elogind: Fix build by explicitly link with librt.

* gnu/packages/freedesktop.scm (elogind)[arguments]: Pass
  'LDFLAGS=-lrt' to configure.

Merge branch 'master' into core-updates

gnu: elogind: Update to version 219.12.

* gnu/packages/freedesktop.scm (elogind): Update to 219.12.  Use a tarball
  instead of a git checkout.