default interface include directories for Swift targets
It would be incredibly useful to default the INTERFACE_INCLUDE_DIRECTORIES
property of Swift targets to Swift_MODULE_DIRECTORY
. The scenario for this is when you use a global CMAKE_Swift_MODULE_DIRECTORY
property to build a project and then create export targets for the Swift components and wish to integrate that into an external CMake project. Having this property default'ed would enable the direct use of the exported targets without any additional configuration.