ConfigPackageLocation is invalid for Windows

[StefanBruens]

libnest2d/CMakeLists.txt

Line 137 in f807ce1

set(ConfigPackageLocation lib/cmake/${PROJECT_NAME})

This matches the the following template in
https://cmake.org/cmake/help/latest/command/find_package.html#search-procedure
<prefix>/(lib/<arch>|lib*|share)/cmake/<name>*/ (Unix)

but this is not included in the default search paths for Windows. For Windows, either a different location should be set, or both Windows/Unix should use one of the common patterns (W/U):

<prefix>/<name>*/(lib/<arch>|lib*|share)/cmake/<name>*/         (W/U)
<prefix>/<name>*/(lib/<arch>|lib*|share)/<name>*/               (W/U)
<prefix>/<name>*/(lib/<arch>|lib*|share)/<name>*/(cmake|CMake)/ (W/U)