Objective-C Availability support

[christiangnrd]

Very much a WIP. Depends on JuliaInterop/ObjectiveC.jl#51. Should be good to go once ObjectiveC.jl v3.4 is released.

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diff --git a/test/version.jl b/test/version.jl
index 4915d49d..d6722fbe 100644
--- a/test/version.jl
+++ b/test/version.jl
@@ -1,11 +1,11 @@
 @testset "Version" begin
 
-@test Metal.darwin_version() isa VersionNumber
-@test Metal.macos_version() isa VersionNumber
-@test Metal.is_macos(Metal.macos_version())
+    @test Metal.darwin_version() isa VersionNumber
+    @test Metal.macos_version() isa VersionNumber
+    @test Metal.is_macos(Metal.macos_version())
 
-@test Metal.metallib_support() isa VersionNumber
-@test Metal.air_support() isa VersionNumber
-@test Metal.metal_support() isa VersionNumber
+    @test Metal.metallib_support() isa VersionNumber
+    @test Metal.air_support() isa VersionNumber
+    @test Metal.metal_support() isa VersionNumber
 
-end # testset "Version"
\ No newline at end of file
+end # testset "Version"