"makes unnecessary" is correct and usable in written English.
You can use it when you are trying to say that an action or a situation eliminates the need for something else. For example, "This new algorithm makes unnecessary the need for manual labor."
The Fed's appeal could also stoke criticism that the central bank makes unnecessary concessions to the banking industry.
The only vice of the Virgin Islands' statute, in an uncontested case like this, is that it makes unnecessary a choice between bigamy and perjury.
This disposition makes unnecessary any discussion whether such segregation also violates the due process clause of the Fourteenth Amendment... We have now announced that such segregation is a denial of the equal protection of the laws".
The revised section removes all doubt as to the venue of continuing offenses and makes unnecessary special venue provisions except in cases where Congress desires to restrict the prosecution of offenses to particular districts as in section 1073 of this revision.
In the interest, however, of orderly procedure, economy in time of both courts, and in the making up and printing of the record, counsel should make every effort to select the proper procedure in review and not duplicate methods out of an abundant caution which the act of 1916 makes unnecessary.
The diversity among non-dominated solutions is introduced by using the crowding-comparison procedure, which makes unnecessary any niching parameter.
"None made unnecessary haste," observed Nourse.
Commissions could provide incentives to churn, where brokers make unnecessary trades to generate commissions.
That may even make unnecessary the powerful Ares V rocket now in the planning.
He later revealed he had been disqualified for making unnecessary contact with other swimmers.
"Half the time, I'm just making unnecessary calls that could wait.
