Native: delete konan_temp right after the compilation instead of on exit

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.

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -85,8 +85,12 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
 
         try {
             val konanConfig = KonanConfig(project, configuration)
-            ensureModuleName(konanConfig, environment)
-            runTopLevelPhases(konanConfig, environment)
+            try {
+                ensureModuleName(konanConfig, environment)
+                runTopLevelPhases(konanConfig, environment)
+            } finally {
+                konanConfig.dispose()
+            }
         } catch (e: Throwable) {
             if (e is KonanCompilationException || e is CompilationErrorException)
                 return ExitCode.COMPILATION_ERROR