[platform lib][posix][windows] base i/o support, w/o networking
[platform lib][posix][windows] base i/o support, w/o networking

wiltonlazary/kotlin-native,JuliusKunze/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,JuliusKunze/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,JetBrains/kotlin-native,JetBrains/kotlin-native,JetBrains/kotlin-native,wiltonlazary/kotlin-native,wiltonlazary/kotlin-native