templates/make: set required minimum version to 3.5 - #113

A large number of projects would still build with CMake >= 4.0 with
-DCMAKE_POLICY_VERSION_MINIMUM=3.5 specified. Most projects simply never
updated their CMake policy version requirement, throwing this error during
build time:

  CMake Error at CMakeLists.txt:2 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

    Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
    to tell CMake that the project requires at least <min> but has been updated
    to work with policies introduced by <max> or earlier.

    Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

Co-authored-by: Mingcong Bai <jeffbai@aosc.io>