macos: tests: fix deleting of scratch dir

macos rm does not understand --one-file-system,
and it cannot handle unreadable directories.

internal/syscallcompat/emulate_test.go

@@ -245,7 +245,7 @@ func TestEmulateSymlinkat(t *testing.T) {
 }
 
 func TestEmulateMkdirat(t *testing.T) {
-	err := emulateMkdirat(tmpDirFd, "mkdirat", 0100)
+	err := emulateMkdirat(tmpDirFd, "mkdirat", 0700)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -257,7 +257,7 @@ func TestEmulateMkdirat(t *testing.T) {
 		t.Fatalf("mkdirat did not create a directory")
 	}
 	// Test with absolute path
-	err = emulateMkdirat(-1, tmpDir+"/mkdirat2", 0100)
+	err = emulateMkdirat(-1, tmpDir+"/mkdirat2", 0700)
 	if err != nil {
 		t.Fatal(err)
 	}

test.bash

@@ -49,7 +49,12 @@ go test -count 1 ./... "$@" 200>&-
 
 # The tests cannot to this themselves as they are run in parallel.
 # Don't descend into possibly still mounted example filesystems.
-rm -Rf --one-file-system $TESTDIR
+if [[ $OSTYPE == *linux* ]] ; then
+	rm -Rf --one-file-system $TESTDIR
+else
+	# MacOS "rm" does not understand "--one-file-system"
+	rm -Rf $TESTDIR
+fi
 
 if grep -R "panic(" internal ; then
 	echo "Please use log.Panic instead of naked panic!"