[Native] Add simple symbol mechanism to konan.properties

Java Properties format is extremely trivial and does not support any
kind of references or variables. It makes konan.properties repetitive.
This commits adds support of perl-like `$` sigil which allows to
reference properties inside values.

native/utils/src/org/jetbrains/kotlin/konan/target/Distribution.kt

@@ -43,6 +43,10 @@ class Distribution(
     fun additionalPropertyFiles(genericName: String) =
         preconfiguredPropertyFiles(genericName) + userPropertyFiles(genericName)
 
+    /**
+     * Please note that konan.properties uses simple resolving mechanism.
+     * See [org.jetbrains.kotlin.konan.properties.resolveValue].
+     */
     val properties by lazy {
         val result = Properties()