Remove mktemp since it’s part of coreutils{,-gplv2} now

A separate mktemp package is not a thing, so the replacement procedure
can be simplified a bit.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

scripts/replace-gplv2-packages-for-dev-env.sh

@@ -4,6 +4,5 @@ set -e
 cp /bin/rm /bin/tar /bin/grep /usr/bin/diff /usr/local/bin
 apt-get update
 DPKGPATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
-apt-get -y -o Dpkg::Path="$DPKGPATH" --allow-remove-essential purge mktemp
 apt-get -y -o Dpkg::Path="$DPKGPATH" --allow-remove-essential install coreutils tar grep diffutils findutils sed
 rm /usr/local/bin/rm /usr/local/bin/tar /usr/local/bin/grep /usr/local/bin/diff