Moved clang flags out of the root build.gardle.

Collected clang args in ClangArgs.kt
Switched dependencies/build.gradle to KonanTarget.
Introduced KonanProperties to take care of target specific properties.

utilities/src/main/kotlin/org/jetbrains/kotlin/cli/utilities/main.kt

@@ -1,6 +1,6 @@
 package org.jetbrains.kotlin.cli.utilities
 
-import org.jetbrains.kotlin.backend.konan.util.File
+import org.jetbrains.kotlin.konan.file.File
 import org.jetbrains.kotlin.cli.bc.main as konancMain
 import org.jetbrains.kotlin.native.interop.gen.jvm.main as cinteropMain
 import org.jetbrains.kotlin.cli.klib.main as klibMain