Improve ABI version error reporting in the compiler

- only report ABI errors if there's at least one other error
- append additional helpful information to the "unresolved reference" error

compiler/testData/cli/jvm/wrongAbiVersionNoErrors.kt

@@ -0,0 +1,7 @@
+// This should compile despite the fact that there are usages of symbols with the wrong ABI version!
+
+import wrong.ClassWithInnerLambda
+
+fun happy(): Int {
+    return 2 + 2
+}