Run plugin tests on MacOS

Author: LittleChimera

pkg/proc/test/support.go

@@ -356,7 +356,7 @@ func WithPlugins(t *testing.T, flags BuildFlags, plugins ...string) []Fixture {
 	if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 12) {
 		t.Skip("versions of Go before 1.12 do not include debug information in packages that import plugin (or they do but it's wrong)")
 	}
-	if runtime.GOOS != "linux" {
+	if runtime.GOOS != "linux" && runtime.GOOS != "darwin" {
 		t.Skip("only supported on linux")
 	}