[CMake] CPack and executable permissions on linux

[Domen Vrankar]

> This could probably be supported by adding USE_SOURCE_PERMISSIONS for
> install(FILES ...) would you be willing to contribute a patch?

Misses that this is not cmake-dev mailing list... Patch would still be
appreciated but you could also file a feature request (for extending
the documentation regarding default permissions and adding
USE_SOURCE_PERMISSIONS) here:
https://cmake.org/Bug/view_all_bug_page.php
Currently registration is disabled so if you don't have an account I
could do it for you.

Regards,
Domen