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Jason RhinelanderWenzel Jakob
c40d8c617f1
Jason Rhinelander authored and Wenzel Jakob committed a3fec901b8c
Avoid CMP0048 warning (#570)

Fixes #567.

If pybind's CMakeLists gets loaded via an include_directory from another
CMakeLists with a higher minimum version (e.g. 3.0), the project()
command without a version produces a CMP0048 warning.

This commit explicitly requests the new behaviour if the policy exists,
as it won't cause problems (we set VERSION later).