ci: install fdisk on Debian

To judge from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=947134 and
44ec91ef11,
`util-linux` no longer depends on `fdisk` so it seems it should be installed
manually.

semaphoreci/semaphore-runner.sh

@@ -36,7 +36,7 @@ apt-get -q --allow-releaseinfo-change update
 apt-get -y dist-upgrade
 apt-get install -y eatmydata
 # The following four are needed as long as these deps are not covered by Debian's own packaging
-apt-get install -y libfdisk-dev libp11-kit-dev libssl-dev libpwquality-dev
+apt-get install -y fdisk libfdisk-dev libp11-kit-dev libssl-dev libpwquality-dev
 apt-get purge --auto-remove -y unattended-upgrades
 systemctl unmask systemd-networkd
 systemctl enable systemd-networkd

travis-ci/managers/debian.sh

@@ -20,6 +20,7 @@ ADDITIONAL_DEPS=(python3-libevdev
                  clang
                  perl
                  libpwquality-dev
+                 fdisk
                  libfdisk-dev
                  libp11-kit-dev
                  libssl-dev