add fixme for the future flJustExtension

apt-pkg/acquire-item.cc

@@ -718,6 +718,10 @@ void pkgAcqIndex::Done(string Message,unsigned long Size,string Hash,
    else if(compExt == "gz") 
       decompProg = "gzip";
    // flExtensions returns the full name if no extension is found
+   // this is why we have this complicated compare operation here
+   // FIMXE: add a new flJustExtension() that return "" if no
+   //        extension is found and use that above so that it can
+   //        be tested against ""
    else if(compExt == flNotDir(URI(Desc.URI).Path))
       decompProg = "copy";
    else {