Problem creating a pull request on github

[stax76]

I want to create a pull request for this project:

https://github.com/chikuzen/avs2pipemod

So I created a fork:

https://github.com/staxrip/avs2pipemod

It did not compile out of the box due to missing avisynth headers, so I changed the project to make it find the header, now it compiles.

Now I created a branch and made my changes I want to be in the pull request, that is adding a UTF8 and long path manifest.

Problem is now when I create a pull request it also includes the header change, but I want that to be excluded.

How would I do this? Is it possible without command line but rather Visual Studio, GitHub Desktop and GitHub Web?