Merge branch 'sv/env-with-equal-sign' into dev

* sv/env-with-equal-sign:
  allow open_port to set env vars containing a trailing '=' character

OTP-8614 sv/env-with-equal-sign

The erlang:open_port spawn and spawn_executable directives can include an
{env,Env} directive to set up environment variables for the spawned
process. A bug prevented applications from using {env,Env} to set an
environment variable whose value ended with a '=' (equal sign) character;
the trailing equal sign was mistaken as an indication that an environment
variable was to be cleared from the environment of the spawned process.
(Thanks to Steve Vinoski.)

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