[cmake] Switch to latexmk

Drop makeindex and printindex, as no
entries are defined and it broke latexmk.
11 jobs for feature/uselatexmk in 28 minutes and 4 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Test
passed #79626
duneci
debian:10 clang-7-libcpp-17

00:05:20

passed #74101
duneci
debian:10 gcc-8-noassert-17

00:13:12

passed #79625
duneci
debian:9 clang-3.8-14

00:08:52

passed #74103
duneci
debian:9 gcc-6-14

00:09:40

passed #74105
duneci
ubuntu:16.04 gcc-5-14

00:08:55

passed #79618
duneci
ubuntu:18.04 clang-6-17

00:05:59

failed #79617
duneci
debian:10 clang-7-libcpp-17

00:02:10

failed #74102
duneci
debian:10 clang-7-libcpp-17

00:00:32

failed #79616
duneci
debian:9 clang-3.8-14

00:02:10

failed #74104
duneci
debian:9 clang-3.8-14

00:04:48

failed #74106
duneci
ubuntu:18.04 clang-6-17

00:02:43