Remove CMake config installation folder only when empty #2622
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With this PR we change, and fix under Windows, the behavior of the uninstall target when uninstalling the installed CMake configuration file folder.
The first commit, d05e0ed, is the proposed solution to the problem.
The second and last commit, e73d7d1, unifies the CMake style in
cmake/uninstall_target.cmake.in
.We can drop the second commit if you feel it should not be applied.
Fixes #2615 (see a detailed discussion there).