CMake: Fix spelling mistake

"Install CMake package configiguration module" --> configuration

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>
Signed-off-by: Ralph Giles <giles@thaumas.net>
2 jobs for typo in 49 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Build
passed autoconf #11648
docker

00:00:49

passed cmake #11649
docker

00:00:19