use proper test skip mechanism for SO_REUSEPORT

Author: IanButterworth

test/distributed_exec.jl

@@ -1707,18 +1707,17 @@ end
         end
 
         # Ensure that the code has indeed been successfully executed everywhere
-        @test all(in(results), procs())
+        return all(in(results), procs())
     end
 
     # Test that the client port is reused. SO_REUSEPORT may not be supported on
     # all UNIX platforms, Linux kernels prior to 3.9 and older versions of OSX
     @assert nprocs() == 1
     addprocs_with_testenv(4; lazy=false)
-    if ccall(:jl_has_so_reuseport, Int32, ()) == 1
-        reuseport_tests()
-    else
-        @info "SO_REUSEPORT is unsupported, skipping reuseport tests"
-    end
+
+    skip_reuseexport = ccall(:jl_has_so_reuseport, Int32, ()) != 1
+    skip_reuseexport && @debug "SO_REUSEPORT support missing, reuseport_tests skipped"
+    @test reuseport_tests() skip = skip_reuseexport
 end
 
 @testset "Even more various individual issues" begin