Disable "nuget update -self" on installation

Author: manako-t

setup.py

@@ -241,9 +241,10 @@ def _install_packages(self):
             nuget = "mono %s" % nuget
             use_shell = True
 
-        cmd = "%s update -self" % nuget
-        self.announce("Updating NuGet: %s" % cmd)
-        check_call(cmd, shell=use_shell)
+        # Disable "nuget update -self" because latest version nuget cannot be executed by mono 4.x
+        # cmd = "%s update -self" % nuget
+        # self.announce("Updating NuGet: %s" % cmd)
+        # check_call(cmd, shell=use_shell)
 
         cmd = "%s restore pythonnet.sln -o packages" % nuget
         self.announce("Installing packages: %s" % cmd)