Simplify the definition of StridedArray; remove third type param (#26012

)

Previously, the `StridedArray` type-alias had three type parameters -- the usual `T` and `N`, but also an `A` parameter that kinda-sorta restricted the "parent" array of some of the view types.  It did not really work, though:

```julia
julia> reshape(codeunits("foo"),1,3) isa StridedArray{<:Any,<:Any,<:Array}
true
```

This commit removes that third type parameter from the binding. This should otherwise be functionally equivalent.

base/sysimg.jl

@@ -219,15 +219,11 @@ include("strings/string.jl")
 # Definition of StridedArray
 StridedReshapedArray{T,N,A<:Union{DenseArray,FastContiguousSubArray}} = ReshapedArray{T,N,A}
 StridedReinterpretArray{T,N,A<:Union{DenseArray,FastContiguousSubArray}} = ReinterpretArray{T,N,S,A} where S
-StridedArray{T,N,A<:Union{DenseArray,StridedReshapedArray},
- I<:Tuple{Vararg{Union{RangeIndex, AbstractCartesianIndex}}}} =
- Union{DenseArray{T,N}, SubArray{T,N,A,I}, StridedReshapedArray{T,N}, StridedReinterpretArray{T,N,A}}
-StridedVector{T,A<:Union{DenseArray,StridedReshapedArray},
- I<:Tuple{Vararg{Union{RangeIndex, AbstractCartesianIndex}}}} =
- Union{DenseArray{T,1}, SubArray{T,1,A,I}, StridedReshapedArray{T,1}, StridedReinterpretArray{T,1,A}}
-StridedMatrix{T,A<:Union{DenseArray,StridedReshapedArray},
- I<:Tuple{Vararg{Union{RangeIndex, AbstractCartesianIndex}}}} =
- Union{DenseArray{T,2}, SubArray{T,2,A,I}, StridedReshapedArray{T,2}, StridedReinterpretArray{T,2,A}}
+StridedSubArray{T,N,A<:Union{DenseArray,StridedReshapedArray},
+ I<:Tuple{Vararg{Union{RangeIndex, AbstractCartesianIndex}}}} = SubArray{T,N,A,I}
+StridedArray{T,N} = Union{DenseArray{T,N}, StridedSubArray{T,N}, StridedReshapedArray{T,N}, StridedReinterpretArray{T,N}}
+StridedVector{T} = Union{DenseArray{T,1}, StridedSubArray{T,1}, StridedReshapedArray{T,1}, StridedReinterpretArray{T,1}}
+StridedMatrix{T} = Union{DenseArray{T,2}, StridedSubArray{T,2}, StridedReshapedArray{T,2}, StridedReinterpretArray{T,2}}
 StridedVecOrMat{T} = Union{StridedVector{T}, StridedMatrix{T}}
 
 # For OS specific stuff