In a Gradle process, the user.dir property is set to the directory
where the build was started. By default, if we start a child process
via project.javaexec, Gradle sets its working directory to the
directory of the current project. But passing Gradle's value of user.dir
to that process overrides this setting.
This makes tools started in a such way sensitive to directory the build
is started from. Thus a test using relative paths may fail if it is
started from a wrong directory.
This patch fixes this issue for Kotlin/Native tests.
Dmitriy Dolovov