cmcmd: Write progress and tar errors directly to stderr

In these code paths, `cmSystemTools::Message` never has a callback
set.  Inline the non-callback implementation at call sites.

Source/cmcmd.cxx

@@ -1112,7 +1112,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args,
       int count;
       if (countFile) {
         if (1 != fscanf(countFile, "%i", &count)) {
-          cmSystemTools::Message("Could not read from count file.");
+          std::cerr << "Could not read from count file.\n";
         }
         fclose(countFile);
       } else {
@@ -1426,8 +1426,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args,
             action = cmSystemTools::TarActionExtract;
           } break;
           default: {
-            cmSystemTools::Message(
+            std::cerr << "tar: Unknown argument: " << flag << "\n";
-              std::string("tar: Unknown argument: ") + flag, "Warning");
           }
         }
       }
@@ -1448,8 +1447,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args,
         }
       } else if (action == cmSystemTools::TarActionCreate) {
         if (files.empty()) {
-          cmSystemTools::Message("tar: No files or directories specified",
+          std::cerr << "tar: No files or directories specified\n";
-                                 "Warning");
         }
         if (!cmSystemTools::CreateTar(outFile, files, compress, verbose, mtime,
                                       format)) {
@@ -1688,7 +1686,7 @@ static void cmcmdProgressReport(std::string const& dir, std::string const& num)
     return;
   }
   if (1 != fscanf(progFile, "%i", &count)) {
-    cmSystemTools::Message("Could not read from progress file.");
+    std::cerr << "Could not read from progress file.\n";
   }
   fclose(progFile);