sim_if/nvc.py: quote words with spaces in printed command

This allows the command to be directly copied and pasted without having
to quote e.g. the JSON in the `-g` argument.

Author: nickg

vunit/sim_if/nvc.py

@@ -275,7 +275,7 @@ def simulate(self, output_path, test_suite_name, config, elaborate_only):
             if wave_file:
                 cmd += [f"--wave={wave_file}"]
 
-        print(" ".join(cmd))
+        print(" ".join([f"'{word}'" if ' ' in word else word for word in cmd]))
 
         status = True