[pdcurses] Add export CMake config

[LilyWangLL]

Fixes #11027, add export CMake config for pdcurses.
Usage test passed on x64-windows.

• Changes comply with the maintainer guide
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[dg0yt]

You applied my remark on the release variant, but this binary must exist. You need to apply it to the debug variant.

[dg0yt]

Okay. Testing actual usage incl. linking is left to you.

(I would not deal with the DLL location in the config file. Just find_library and IMPORTED_LOCATION is enough, works across linkage and platforms, and is handled this way in similar find modules.)