Cut out extra requires

Requires SciML/SciMLSensitivity.jl#575 kind of, but not really, it's just a small optimization

Author: ChrisRackauckas

src/init.jl

@@ -1,10 +1,4 @@
 function __init__()
-  @require ApproxFun="28f2ccd6-bb30-5033-b560-165f7b14dc2f" begin
-    RecursiveArrayTools.recursive_unitless_eltype(a::ApproxFun.Fun) = typeof(a)
-    RecursiveArrayTools.recursive_unitless_bottom_eltype(a::ApproxFun.Fun) = recursive_unitless_bottom_eltype(ApproxFun.coefficients(a))
-    RecursiveArrayTools.recursive_bottom_eltype(a::ApproxFun.Fun) = recursive_bottom_eltype(ApproxFun.coefficients(a))
-  end
-
   @require CUDA="052768ef-5323-5732-b1bb-66c8b64840ba" begin
     function CUDA.CuArray(VA::AbstractVectorOfArray)
       vecs = vec.(VA.u)
@@ -13,12 +7,4 @@ function __init__()
     Base.convert(::Type{<:CUDA.CuArray},VA::AbstractVectorOfArray) = CUDA.CuArray(VA)
     ChainRulesCore.rrule(::Type{<:CUDA.CuArray},xs::AbstractVectorOfArray) = CUDA.CuArray(xs), ȳ -> (NoTangent(),ȳ)
   end
-
-  @require Tracker="9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c" begin
-    function recursivecopy!(b::AbstractArray{T,N},a::AbstractArray{T2,N}) where {T<:Tracker.TrackedArray,T2<:Tracker.TrackedArray,N}
-      @inbounds for i in eachindex(a)
-        b[i] = copy(a[i])
-      end
-    end
-  end
 end