-fno-warn lines in the lexer can be removed with Alex 3.1.5

[Ben Gamari]

Ömer Sinan Ağacan <omeragacan at gmail.com> writes:

> I was working on the lexer today and realized that we can now remove
> -fno-warn lines in the lexer if we're OK with requiring Alex >=3.1.5.

No objection from me; 3.1.5 was released nearly a year ago and it's easy
enough to update.

Cheers,

- Ben

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