[K/N] Convert :kotlin-native:Interop:StubGenerator

Use folder structure from the rest of the project and build it by
the bootstrap compiler.

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/dependency.def

@@ -0,0 +1,2 @@
+headers = dependency.h
+headerFilter = dependency.h

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/dependency.h

@@ -0,0 +1,4 @@
+struct DependencyUsed;
+struct DependencyUnused;
+
+struct DependencyAndMain;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/imported.h

@@ -0,0 +1,2 @@
+struct ImportedUsed;
+struct ImportedUnused;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/included.h

@@ -0,0 +1,2 @@
+struct IncludedUsed;
+struct IncludedUnused;

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/main.def

@@ -0,0 +1,2 @@
+headers = main.h
+headerFilter = main.h included.h dependency.h

kotlin-native/Interop/StubGenerator/testResources/ForwardDeclarations/struct/main.h

@@ -0,0 +1,12 @@
+#include "dependency.h"
+#include "imported.h"
+#include "included.h"
+
+struct MainUsed;
+struct MainUnused;
+struct DependencyAndMain;
+
+void useDependency(struct DependencyUsed*);
+void useImported(struct ImportedUsed*);
+void useIncluded(struct IncludedUsed*);
+void useMain(struct MainUsed*);