Hookup AssemblyResolver's assembly version warning in ikvmc.

ikvmc/Compiler.cs

@@ -94,6 +94,7 @@ class IkvmcCompiler
 		int rc = comp.ParseCommandLine(argList.GetEnumerator(), targets, toplevel);
 		if (rc == 0)
 		{
+			loader.HigherVersion += new AssemblyResolver.HigherVersionEvent(loader_HigherVersion);
 			loader.Init(StaticCompiler.Universe, nostdlib, toplevel.unresolvedReferences, libpaths);
 		}
 		if (rc == 0)
@@ -138,6 +139,11 @@ class IkvmcCompiler
 		return rc;
 	}
 
+	static void loader_HigherVersion(AssemblyName assemblyDef, AssemblyName assemblyRef)
+	{
+		StaticCompiler.IssueMessage(Message.AssumeAssemblyVersionMatch, assemblyDef.FullName, assemblyRef.FullName);
+	}
+
 	private static int ResolveStrongNameKeys(List<CompilerOptions> targets)
 	{
 		foreach (CompilerOptions options in targets)

ikvmc/CompilerClassLoader.cs

@@ -3184,6 +3184,7 @@ namespace IKVM.Internal
 		EmittedClassFormatError = 120,
 		InvalidCustomAttribute = 121,
 		IgnoredCustomAttribute = 122,
+		AssumeAssemblyVersionMatch = 123,
 	}
 
 	static class StaticCompiler
@@ -3381,6 +3382,9 @@ namespace IKVM.Internal
 					msg = "custom attribute \"{0}\" was ignored" + Environment.NewLine +
 						"    (\"{1}\")";
 					break;
+				case Message.AssumeAssemblyVersionMatch:
+					msg = "assuming assembly reference \"{0}\" matches \"{1}\", you may need to supply runtime policy";
+					break;
 				default:
 					throw new InvalidProgramException();
 			}