[PATCH cygport 2/3] Don't allow SRC_URI or PATCH_URI to depend on ARCH

[Andrew Schulman]

> The values which SRC_URI and PATCH_URI evaluate to should not change
> depending on ARCH, as this will make the source package arch-dependent

In that case what's the right thing to do when we have arch-specific
patches? For example screen has one, for x86_64 only.