tests: status::worktree: indicate skipped tests on Win32

Some function bodies of tests which are not applicable to the Win32
platform are completely #ifdef'd out instead of calling `cl_skip()`.
This leaves us with no indication that these tests are not being
executed at all and may thus cause decreased scrutiny when investigating
skipped tests. Improve the situation by calling `cl_skip()` instead of
just doing nothing.

(cherry picked from commit 72c28ab0)

tests/checkout/tree.c

@@ -1086,6 +1086,8 @@ void test_checkout_tree__filemode_preserved_in_workdir(void)
 	cl_assert(!GIT_PERMS_IS_EXEC(read_filemode("a/b.txt")));
 
 	git_commit_free(commit);
+#else
+	cl_skip();
 #endif
 }
 

tests/iterator/workdir.c

@@ -741,6 +741,8 @@ void test_iterator_workdir__skips_fifos_and_special_files(void)
 	cl_assert_equal_i(GIT_ITEROVER, git_iterator_advance(&e, i));
 
 	git_iterator_free(i);
+#else
+	cl_skip();
 #endif
 }
 

tests/repo/open.c

@@ -180,6 +180,8 @@ void test_repo_open__from_git_new_workdir(void)
 	cl_assert_(git__suffixcmp(git_repository_workdir(repo2), "alternate/") == 0, git_repository_workdir(repo2));
 
 	git_repository_free(repo2);
+#else
+	cl_skip();
 #endif
 }
 

tests/status/worktree.c

@@ -1072,6 +1072,8 @@ void test_status_worktree__unreadable(void)
 	cl_assert_equal_i(counts.expected_entry_count, counts.entry_count);
 	cl_assert_equal_i(0, counts.wrong_status_flags_count);
 	cl_assert_equal_i(0, counts.wrong_sorted_path);
+#else
+	cl_skip();
 #endif
 }
 
@@ -1106,6 +1108,8 @@ void test_status_worktree__unreadable_not_included(void)
 	cl_assert_equal_i(counts.expected_entry_count, counts.entry_count);
 	cl_assert_equal_i(0, counts.wrong_status_flags_count);
 	cl_assert_equal_i(0, counts.wrong_sorted_path);
+#else
+	cl_skip();
 #endif
 }