[issue1341] printenv(1): don't allow '=' in name

Stathis Kamperis <[e-mail]> added the comment:

: Wasn't this already commited?
: I remember seeing something about '=3D's in some env function.

Hey alexh. That patch was about setenv(3), which is now fixed.
printenv(3) needs to be fixed as well.

Cheers,
Stathis

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