I attached configure files, cause they're part of main tree. I though, that if they're intended to being generated, they would already be listed in .gitignore file. So, must I avoid sending both "configure" and "configure.ac" files?
The configure file is generated, and you should always avoid sending changes to that. That was not the reason I said you should not have them in the patch.
Your change to configure.ac appears to add gameux.dll, which you don't want to do just yet.
Also, should I fix it, and resend these patches again now?
You can do that, or you can wait and see what happens on http://source.winehq.org/patches/
The patch adding the header file looks good to me and does not depend on any other patches, so it may be accepted, or you may need to change it. Or Alexandre may just wait for you to resend the whole series correctly. I cannot guess.