The Kotlin/Native compiler uses `.deleteOnExit()` as a substitute for
"delete after the compilation". But when the compiler runs in a Gradle
daemon, `.deleteOnExit()` means "delete on Gradle daemon exit", which
might be not soon. If a single Gradle daemon runs the compiler many
times, the remaining temporary files can consume quite a lot of disk
space. For example, this is the case for the Kotlin build.
Replace some of `.deleteOnExit()` calls with an explicit removal of
temporary files at the end of a compilation session.
Svyatoslav Scherbina
4cf10686d6