[CMake] [CPACK] Patch with componentwise extra install commands for NSIS-generator

[Marcel]

Hi,

I extended cpack's NSIS-generator and want to contribute the attached patch.

It adds the CPACK_COMPONENT_<name>_EXTRA_INSTALL_COMMANDS option to 
cpack that allows to add NSIS commands exclusivly to the install section 
generated for the component <name>. So it adopts the option 
CPACK_NSIS_EXTRA_INSTALL_COMMANDS for single components/sections.

That way special code can be added to a section that ist only executed 
if the user chooses to install the section.

Perhaps this change could be merged into the cmake, because I think this 
could be of some use for other cpack users.

If this is not the right place to contribute, could someone please give 
me a pointer.

Best regards,

Marcel

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