[CMake] CPack/NSIS multiple component intall location

[Romuald Delmont]

Hi

I finally manage this by building 2 components: Data (obviously for
Data) and Unspecified for everything else.

Tell CPACK to not include Data component, using
SET(CPACK_INSTALL_CMAKE_PROJECTS
"${CMAKE_BINARY_DIR};${CMAKE_PROJECT_NAME};Unspecified;/")

And finally package Data component manually by changing some things in
NSIS.template.in

Not perfect but it does the job.

Thanks for your suggestions.