The line in the PKGBUILD that actually applies that patch is commented out, so you can probably just remove that filename from the source array to eliminate the error.
- [arch-general] Can't build libwebkit Bastien Dejean
- Re: [arch-general] Can't build libwebkit Taylor Hedberg
- Re: [arch-general] Can't build libwebkit Andrea Scarpino
- Re: [arch-general] Can't build libwebkit Andrea Scarpino
- Re: [arch-general] Can't build libwebkit Bastien Dejean
- Re: [arch-general] Can't build libwebkit Andrea Scarpino
- Re: [arch-general] Can't build libwe... Jan de Groot