Bug#1094444: cmake breaks lfortran autopkgtest

[Brad King]

The original failure was fixed by CMake 3.31.4.

The current failure is visible in the lfortran test log:

> autopkgtest [16:12:29]: test project1-plain: - - - - - - - - - - stderr - - - - - - - - - -
> CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
> Compatibility with CMake < 3.10 will be removed from a future version of
> CMake.

lfortran's `examples/project1/CMakeLists.txt` needs to be updated
to set policies to at least CMake 3.10.  Other examples probably
need similar updates.

-Brad