Do not reset freeCompilerArgs for some kotlin-native modules

Otherwise common compiler arguments which are set for all modules in the
project in `buildSrc/src/main/kotlin/common-configuration.gradle.kts`
are not applied. The most interesting of those are `-Xuse-k2` (if K2 is
enabled) and `-Xjvm-default=all`.

kotlin-native/utilities/cli-runner/build.gradle

@@ -10,7 +10,7 @@ apply plugin: 'kotlin'
 
 compileKotlin {
     kotlinOptions {
-        freeCompilerArgs = ['-Xskip-metadata-version-check']
+        freeCompilerArgs += ['-Xskip-metadata-version-check']
     }
 }