Created attachment 463402 [details, diff] libreoffice-5.3-system-pyuno.patch rebased on latest LO libreoffice-5.3-system-pyuno.patch fails to apply for app-office/libreoffice-9999 There were some upstream changes on that affected files.
Thanks for your patch, fixed in commit d09290006a6203b3fad5375584a98b2ce46ad8f1