Upgrade CMake to at least 3.10

[capitalistspz]

As of CMake 4.0 (March 2025), compatibility with versions below 3.5 (March 2016) has been removed, and compatibility with versions below 3.10 (November 2017) is planned to be removed.

Trying to use this library with CMake 4.2.2 produces this output

CMake Error at CMakeLists.txt:7 (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.

[scheibel]

Thanks for reporting.
We upgraded the minimum required cmake version for an upstream project lately, and I now bumped this version to cmake 3.15 for globjects as well (10c1ce9).

This fix is now applied to the branches master, v2, and v2.0.