CMake: Include CMakePrintHelpers

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1bfbb5..16d92c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,10 @@
 
 include(CMakePackageConfigHelpers)
 
+# Include convenience functions for printing properties and variables, like
+# cmake_print_properties(), cmake_print_variables().
+include(CMakePrintHelpers)
+
 # https://cmake.org/cmake/help/latest/policy/CMP0011.html
 # Setting this policy is required in CMake >= 3.18.0, otherwise a warning is generated. The OLD
 # policy setting is deprecated, and will be removed in future versions.