Skip MKL tests when MKL is not loaded (e.g. 32-bit x86) and bump MKL compat

MKL doesn't ship 32-bit binaries, so `using MKL` is a no-op on x86.
Guard MKL tests behind `mkl_is_loaded()` check instead of failing.
Also bump MKL compat to include 0.9 (subsumes PR #110).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: carstenbauer

Project.toml

@@ -27,7 +27,7 @@ DelimitedFiles = "1"
 Distributed = "1"
 Libdl = "1"
 LinearAlgebra = "1"
-MKL = "0.4, 0.6"
+MKL = "0.4, 0.6, 0.9"
 MPI = "0.20"
 MPIPreferences = "0.1"
 PrecompileTools = "1"

test/tests_mkl.jl

@@ -3,16 +3,20 @@ using ThreadPinning
 using Test
 using MKL
 
-@testset "MKL utilities" begin
-    @test ThreadPinning.MKL.mkl_is_loaded()
-    @test ThreadPinning.MKL.mkl_get_dynamic() isa Integer
-    @test isnothing(ThreadPinning.MKL.mkl_set_dynamic(1))
-    @test ThreadPinning.MKL.mkl_get_dynamic() == 1
-    @test isnothing(ThreadPinning.MKL.mkl_set_dynamic(0))
-    @test ThreadPinning.MKL.mkl_get_dynamic() == 0
-end
+if !ThreadPinning.MKL.mkl_is_loaded()
+    @warn "MKL not loaded (e.g. no MKL binaries on 32-bit), skipping MKL tests."
+else
+    @testset "MKL utilities" begin
+        @test ThreadPinning.MKL.mkl_is_loaded()
+        @test ThreadPinning.MKL.mkl_get_dynamic() isa Integer
+        @test isnothing(ThreadPinning.MKL.mkl_set_dynamic(1))
+        @test ThreadPinning.MKL.mkl_get_dynamic() == 1
+        @test isnothing(ThreadPinning.MKL.mkl_set_dynamic(0))
+        @test ThreadPinning.MKL.mkl_get_dynamic() == 0
+    end
 
-@testset "MKL threadinfo" begin
-    @test isnothing(threadinfo())
-    @test isnothing(threadinfo(; blas = true, hints = true))
+    @testset "MKL threadinfo" begin
+        @test isnothing(threadinfo())
+        @test isnothing(threadinfo(; blas = true, hints = true))
+    end
 end