Ahhh, I didn't put the "PATH" part of the code in the command promp. When you go to the MinGW folder there is a "Source" folder, That's where the mame0147s and mame0143s are.
I copied them to the bin folder where the "diff.exe" is and ran the command prompt again, After that the second prompt window did something and closed after a few seconds.
After this the "patch.diff" was generated but it's 0KB in size...
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