`#include <Windows.h>` with uppercase W breaks cross-compilation

This commit moves an #include <windows.h> from Source/cmFileLockResult.h to Source/cmFileLockResult.cxx, but in the process replaces the lowercase "w" with an uppercase "W", which breaks cross-compilation of CMake from Debian to Windows.

It seems to be an accident; would it be possible to fix the include file name to the all-lowercase form?

Both the master and release branches are affected, as well as the 3.28.0-rc6 version.

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