do not warn for compiler generated operators

[pooya]

The following program

bar() ->
    [{foo, hello:world() == bar}], ok.

warns about the unused '=:=' operator which the compiler replaces '==' with.

[OTP-Maintainer]

The summary line of the commit message is too long and/or ends with a "."
Make sure the whole message follows the guidelines here: https://github.com/erlang/otp/wiki/Writing-good-commit-messages.

---

I am a script, I am not human

---

[OTP-Maintainer]

The summary line of the commit message is too long and/or ends with a "."
Make sure the whole message follows the guidelines here: https://github.com/erlang/otp/wiki/Writing-good-commit-messages.

---

I am a script, I am not human

---

[OTP-Maintainer]

Patch has passed first testings and has been assigned to be reviewed

---

I am a script, I am not human

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[bjorng]

No.

Suppressing the warning entirely is not OK.