mcedit is now symlink to mc which causes subshell error to be displayed every time mcedit is run

When you run MC and then you try to run another MC from within already running MC, it will show red error message because there can be only one subshell per terminal. This is correct. Nobody wants to run MC from MC.

However before /usr/bin/mc and /usr/bin/mcedit were different programs, so when you opened MC and then typed "mcedit /some/path/file.txt" it didn't shown this error, which is correct. Now mcedit is symlink to mc, so when I run "mcedit /some/path/file.txt" mc shows this error message even tho it is no longer relevant, I'm not running mc but mcedit.

I think there was some detection code that understood that mcedit is not mc but this detection code got lost somewhere.

It makes mcedit unusable from commandline as I need to dismiss pointless error message every time.

Tested in Ubuntu 20.04.1 LTS

How to reproduce:

1. Run mc
2. Type "mcedit /etc/issue" (without quotes)
3. Red error will be displayed (this error is meant for MC, not for MCEDIT)