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cmake: Enable --warn-uninitialized in string(CONFIGURE) and configure_file

Artur Ryt requested to merge R2RT/cmake:fix-warn-uninitialized-in-configure into master

Example cases are visible in tests.

I had removed some of removeEmpty logic in NEW CMP0053, as the key assumption in these changes was to make --warn-uninitialized consistent. It is common logic that CMake replaces uninitailized variables with empty strings and --warn-uninitialized can help with protecting yourself from it.

Solves #18489 (closed)

Edited by Artur Ryt

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