Add a versioned provides for sed

So that other packages which define a versioned dependency can pull this GPLv2 vesion of sed.

Signed-off-by: Ritesh Raj Sarraf ritesh.sarraf@collabora.com

Otherwise, results in a dependency failure like the following:

Recommended packages:
  vim-asciidoc arch-test dput | dupload lintian debian-keyring equivs
  libsoap-lite-perl libalgorithm-merge-perl xdg-desktop-portal-gtk
  | xdg-desktop-portal-backend manpages manpages-dev libfile-fcntllock-perl
  gpg-wks-client fonts-droid-fallback libhtml-format-perl javascript-common
  libdata-dump-perl obs-build libmail-sendmail-perl pbzip2
  liblog-log4perl-perl tex-gyre libfile-mimeinfo-perl libnet-dbus-perl
  libx11-protocol-perl
The following packages will be REMOVED:
  sed-gplv2
The following NEW packages will be installed:
  acl adwaita-icon-theme asciidoc asciidoc-base asciidoc-common
  asciidoc-dblatex asciidoc-doc at at-spi2-core attr autoconf autoconf-archive
  automake autopoint autotools-dev bash bash-completion bc binfmt-support
  binutils binutils-common binutils-x86-64-linux-gnu bison bsdmainutils
  bubblewrap build-essential bzip2 ca-certificates-java cdbs check chrpath
  cmake cmake-data comerr-dev cowbuilder cowdancer cpio cpp cpp-8 curl dblatex
  dblatex-doc dbus dbus-user-session dconf-gsettings-backend dconf-service
  dctrl-tools debhelper debian-archive-keyring debootstrap default-jdk

......snipped........

rsync ruby ruby-did-you-mean ruby-minitest ruby-net-telnet ruby-power-assert
  ruby-test-unit ruby-xmlrpc ruby2.5 rubygems-integration sed sgml-base
  sgml-data sgmlspl shared-mime-info ssl-cert strace sudo swig swig3.0
  symlinks systemd systemd-sysv systemtap-sdt-dev t1utils tcl tcl-expect
  tcl8.6 teckit tex-common texinfo texlive texlive-base texlive-bibtex-extra
  texlive-binaries texlive-extra-utils texlive-fonts-recommended
  texlive-formats-extra texlive-generic-recommended texlive-lang-greek
  texlive-latex-base texlive-latex-extra texlive-latex-recommended
  texlive-pictures texlive-plain-generic texlive-science texlive-xetex tipa tk
  tk8.6 ucf udev unzip uuid-dev valac valac-0.42-vapi valgrind valgrind-dbg
  vim vim-common vim-runtime w3m wdiff wget wpasupplicant x11-common x11-utils
  x11-xkb-utils x11-xserver-utils x11proto-core-dev x11proto-dev xauth
  xbitmaps xdelta xdelta3 xdg-dbus-proxy xdg-desktop-portal xdg-user-dirs
  xdg-utils xfce4-dev-tools xfonts-base xfonts-encodings xfonts-utils xkb-data
  xml-core xmlto xorg-sgml-doctools xserver-common xsltproc xterm xtrans-dev
  xvfb xxd xz-utils zip zlib1g-dev
WARNING: The following essential packages will be removed.
This should NOT be done unless you know exactly what you are doing!
  sed-gplv2
[91mE: Essential packages were removed and -y was used without --allow-remove-essential.
[0m0 upgraded, 827 newly installed, 1 to remove and 0 not upgraded.

The dependency chain is:

p   xmlto       Depends docbook-xsl (>= 1.64.1.0)
i A docbook-xsl Depends xml-core (>= 0.12)
i   xml-core    Depends sed (>= 4.1.2-8)