julia: remove redundant diagonal test patch

Fix merged upstream and backported to Julia 1.0.5:

    https://github.com/JuliaLang/julia/pull/31443

pkgs/development/compilers/julia/1.0.nix

@@ -88,7 +88,6 @@ stdenv.mkDerivation rec {
   ;
 
   patches = [
-    ./diagonal-test.patch
     ./use-system-utf8proc-julia-1.0.patch
   ];
 

pkgs/development/compilers/julia/diagonal-test.patch

@@ -1,27 +0,0 @@
-From 9eb180c523b877a53b9e1cf53a4d5e6dad3d7bfe Mon Sep 17 00:00:00 2001
-From: Lars Jellema <lars.jellema@gmail.com>
-Date: Sat, 19 Sep 2020 13:52:20 +0200
-Subject: [PATCH] Use approximate comparisons for diagonal tests
-
----
- stdlib/LinearAlgebra/test/diagonal.jl | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/stdlib/LinearAlgebra/test/diagonal.jl b/stdlib/LinearAlgebra/test/diagonal.jl
-index e420d5bc6d..7f1b5d0aec 100644
---- a/stdlib/LinearAlgebra/test/diagonal.jl
-+++ b/stdlib/LinearAlgebra/test/diagonal.jl
-@@ -450,8 +450,8 @@ end
-         M = randn(T, 5, 5)
-         MM = [randn(T, 2, 2) for _ in 1:2, _ in 1:2]
-         for transform in (identity, adjoint, transpose, Adjoint, Transpose)
--            @test lmul!(transform(D), copy(M)) == *(transform(Matrix(D)), M)
--            @test rmul!(copy(M), transform(D)) == *(M, transform(Matrix(D)))
-+            @test lmul!(transform(D), copy(M)) ≈ *(transform(Matrix(D)), M)
-+            @test rmul!(copy(M), transform(D)) ≈ *(M, transform(Matrix(D)))
-             @test lmul!(transform(DD), copy(MM)) == *(transform(fullDD), MM)
-             @test rmul!(copy(MM), transform(DD)) == *(MM, transform(fullDD))
-         end
--- 
-2.28.0
-