Revert simpleOsName in HostManager

Support old naming in simpleOsName.
Introduce new platformName method for the new archive naming.

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/native/NativePlatformLibsIT.kt

@@ -52,7 +52,7 @@ class NativePlatformLibsIT : BaseGradleIT() {
 
     private fun deleteInstalledCompilers() {
         // Clean existing installation directories.
-        val osName = HostManager.simpleOsName()
+        val osName = HostManager.platformName()
         val oldCompilerDir = DependencyDirectories.localKonanDir.resolve("kotlin-native-$osName-$oldCompilerVersion")
         val currentCompilerDir = DependencyDirectories.localKonanDir.resolve("kotlin-native-$osName-$currentCompilerVersion")
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/NativeCompilerDownloader.kt

@@ -45,7 +45,7 @@ class NativeCompilerDownloader(
         get() = NativeDistributionTypeProvider(project).getDistributionType(compilerVersion)
 
     private val simpleOsName: String
-        get() = HostManager.simpleOsName()
+        get() = HostManager.platformName()
 
     private val dependencyName: String
         get() {