tests: Fix warnings

tests/diff/workdir.c

@@ -2080,7 +2080,7 @@ void test_diff_workdir__to_index_pathlist(void)
 	cl_git_pass(git_repository_index(&index, g_repo));
 
 	opts.flags = GIT_DIFF_INCLUDE_IGNORED;
-	opts.pathspec.strings = pathlist.contents;
+	opts.pathspec.strings = (char **)pathlist.contents;
 	opts.pathspec.count = pathlist.length;
 
 	cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, &opts));

tests/revwalk/basic.c

@@ -456,7 +456,8 @@ void test_revwalk_basic__big_timestamp(void)
 	cl_git_pass(git_signature_new(&sig, "Joe", "joe@example.com", 2399662595, 0));
 	cl_git_pass(git_commit_tree(&tree, tip));
 
-	cl_git_pass(git_commit_create(&id, _repo, "HEAD", sig, sig, NULL, "some message", tree, 1, &tip));
+	cl_git_pass(git_commit_create(&id, _repo, "HEAD", sig, sig, NULL, "some message", tree, 1,
+		(const git_commit **)&tip));
 
 	cl_git_pass(git_revwalk_push_head(_walk));