Dont manipulate pointer from getenv

Found this when looking to fix bug https://github.com/profanity-im/profanity/issues/1357
Not sure if it is related.

man 3 getenv sais:
```
As  typically implemented, getenv() returns a pointer to a string within
the environment list.  The caller must take  care  not  to  modify  this
string, since that would change the environment of the process.
```

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