Don't import unused names

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (50d0bf1) 82.50% compared to head (368ec71) 82.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #39 +/- ## ======================================= Coverage 82.50% 82.50% ======================================= Files 2 2 Lines 200 200 ======================================= Hits 165 165 Misses 35 35 ``` | [Files](https://app.codecov.io/gh/JuliaApproximation/GenericFFT.jl/pull/39?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/GenericFFT.jl](https://app.codecov.io/gh/JuliaApproximation/GenericFFT.jl/pull/39?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0dlbmVyaWNGRlQuamw=) | `66.66% <ø> (ø)` | |

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[milankl]

On this note, why do we import functions from FFTW, they technically should live in AbstractFFTs and both FFTW and GenericFFT should import those right?

[jishnub]

I think dct is defined in FFTW, and isn't provided by AbstractFFTs