cmake: Remove stray support for lcms1 in pdftocairo

7 jobs for more_cmake_stuff in 3 minutes and 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #3908135
build

00:03:23

passed #3908140
build_android

00:00:35

passed #3908136
build_clang_libcpp

00:03:14

passed #3908139
build_clazy

00:03:18

passed #3908138
build_mingw64_fedora

00:03:18

passed #3908137
build_ubuntu_16_04

00:01:28

passed #3908134
clang_format

00:00:54