t3600: Avoid "cp -a", which is a GNUism

With d4a7ffa (tests: "cp -a" is a GNUism, 2012-10-08), we got rid of most of them, but the ones in a topic that was still in flight were missed. Signed-off-by: Junio C Hamano <gitster@pobox.com>

Junio C Hamano committed Dec 18, 2012 at 18:47 UTC 2d3ac9ad67b7038e1046dad3b1a273ba29282f31
1 file changed +3 -3
t/t3600-rm.sh
+3 -3
@@ -474,7 +474,7 @@ test_expect_success 'rm of a conflicted populated submodule with a .git director
474 git submodule update &&
475 (cd submod &&
476 rm .git &&
477 - cp -a ../.git/modules/sub .git &&
477 + cp -R ../.git/modules/sub .git &&
478 GIT_WORK_TREE=. git config --unset core.worktree
479 ) &&
480 test_must_fail git merge conflict2 &&
@@ -508,7 +508,7 @@ test_expect_success 'rm of a populated submodule with a .git directory fails eve
508 git submodule update &&
509 (cd submod &&
510 rm .git &&
511 - cp -a ../.git/modules/sub .git &&
511 + cp -R ../.git/modules/sub .git &&
512 GIT_WORK_TREE=. git config --unset core.worktree
513 ) &&
514 test_must_fail git rm submod &&
@@ -606,7 +606,7 @@ test_expect_success 'rm of a populated nested submodule with a nested .git direc
606 git submodule update --recursive &&
607 (cd submod/subsubmod &&
608 rm .git &&
609 - cp -a ../../.git/modules/sub/modules/sub .git &&
609 + cp -R ../../.git/modules/sub/modules/sub .git &&
610 GIT_WORK_TREE=. git config --unset core.worktree
611 ) &&
612 test_must_fail git rm submod &&