btyacc: Update to 20210109
btyacc: Update to 20210109

* PKGBUILD:
  - change url to github repo since https://invisible-mirror.net appears
    to refuse download by CI.
  - change top src dir

atom2013/MSYS2-packages,Alexpux/MSYS2-packages,atom2013/MSYS2-packages,atom2013/MSYS2-packages,mati865/MSYS2-packages,Alexpux/MSYS2-packages,Alexpux/MSYS2-packages,JPeterMugaas/MSYS2-packages,mati865/MSYS2-packages,JPeterMugaas/MSYS2-packages,mati865/MSYS2-packages,Alexpux/MSYS2-packages,JPeterMugaas/MSYS2-packages,waterlan/MSYS2-packages,JPeterMugaas/MSYS2-packages,atom2013/MSYS2-packages,waterlan/MSYS2-packages,mati865/MSYS2-packages,waterlan/MSYS2-packages,waterlan/MSYS2-packages