Bump minimum CMake version to 3.10

This bumps the minimally required CMake version from 3.5 to 3.10, as
discussed in D8405.

Since D7649 landed, there has been the `gtest_discover_tests()` call to
discover individual unit tests in `bin/tests/blender_test`. This
function was introduced in CMake 3.10.

Since there were no complaints about this incompatibility, I suspect
that a newer version is already in use by the majority of the
Blender-building people.

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