This causes Slint source code being retrieved every time a cmake configuration is triggered.

CMake Warning at CMakeLists.txt:4 (find_package):
[cmake] By not providing "FindSlint.cmake" in CMAKE_MODULE_PATH this project has
[cmake] asked CMake to find a package configuration file provided by "Slint", but
[cmake] CMake did not find one.
[cmake]
[cmake] Could not find a package configuration file provided by "Slint" with any of
[cmake] the following names:
[cmake]
[cmake] SlintConfig.cmake
[cmake] slint-config.cmake
[cmake]
[cmake] Add the installation prefix of "Slint" to CMAKE_PREFIX_PATH or set
[cmake] "Slint_DIR" to a directory containing one of the above files. If "Slint"
[cmake] provides a separate development package or SDK, be sure it has been
[cmake] installed.