wcmd: No Error-Message, when deleting a nonexistent env_var

[Detlef Riekenberg]

actual wine: Text for ERROR_ENVVAR_NOT_FOUND (#203)
w98se/command.com (native): no message
w2k/cmd.exe (in wine): no message


Changelog:
- Do not print an Error-Message, when deleting a nonexistent env_var.


-- 
By By ...
      ... Detlef
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