rrn/rd/KT-55578 User-provided hints for linker errors

[K/N] KT-55578 Show customized user suggestions on linkage errors

Merge-request: KT-MR-9636
Merged-by: Gleb Lukianets <Gleb.Lukianets@jetbrains.com>

native/utils/src/org/jetbrains/kotlin/konan/util/DefFile.kt

@@ -135,6 +135,10 @@ class DefFile(val file:File?, val config:DefFileConfig, val manifestAddendProper
         val objcClassesIncludingCategories by lazy {
             properties.getSpaceSeparated("objcClassesIncludingCategories")
         }
+
+        val userSetupHint by lazy {
+            properties.getProperty("userSetupHint")
+        }
     }
 }