fix #52025, re-allow all implicit pointer casts in cconvert for Array (#53659)

fix #52025

(cherry picked from commit f9e08f7)

Author: JeffBezanson

base/refpointer.jl

@@ -171,8 +171,8 @@ if is_primary_base_module
     Ref(x::AbstractArray, i::Integer) = RefArray(x, i)
 end
 
-cconvert(::Type{Ptr{P}}, a::Array{P}) where {P<:Union{Ptr,Cwstring,Cstring}} = getfield(a, :ref)
-cconvert(::Type{Ref{P}}, a::Array{P}) where {P<:Union{Ptr,Cwstring,Cstring}} = getfield(a, :ref)
+cconvert(::Type{Ptr{P}}, a::Array{<:Union{Ptr,Cwstring,Cstring}}) where {P<:Union{Ptr,Cwstring,Cstring}} = getfield(a, :ref)
+cconvert(::Type{Ref{P}}, a::Array{<:Union{Ptr,Cwstring,Cstring}}) where {P<:Union{Ptr,Cwstring,Cstring}} = getfield(a, :ref)
 cconvert(::Type{Ptr{P}}, a::Array) where {P<:Union{Ptr,Cwstring,Cstring}} = Ref{P}(a)
 cconvert(::Type{Ref{P}}, a::Array) where {P<:Union{Ptr,Cwstring,Cstring}} = Ref{P}(a)
 

test/ccall.jl

@@ -1934,3 +1934,6 @@ end
     end
     @test_throws "could not load symbol \"test\"" somefunction_not_found_libc()
 end
+
+# issue #52025
+@test Base.unsafe_convert(Ptr{Ptr{Cchar}}, Base.cconvert(Ptr{Ptr{Cchar}}, map(pointer, ["ab"]))) isa Ptr{Ptr{Cchar}}