Support longer output (up to 1mb)

zig/sdl/hello_sdl.zig

    for (argv) |arg| {
        std.debug.print("'{s}' ", .{arg});
    }
    const result = try std.ChildProcess.exec(.{ .allocator = allocator, .argv = argv });
    const result = try std.ChildProcess.exec(.{ .allocator = allocator, .argv = argv, .max_output_bytes = 1024 * 1024 });
    std.debug.print("stderr: '{s}'\n", .{result.stderr});
    defer {
        // FIXME: allocator.free(result.stdout);