x11-toolkits/copperspice: use distributed tarballs, not for i386

• Switch to the distributed tarballs, rather than pulling from github. This means NO_WRKSUBDIR, dos2unix, and removing the patches that apply to sources in GH but that are not in the released source tarballs.
• Set NOT_FOR_ARCHS to i386, since there's issues in WebKit like

ld: error: relocation R_386_PC32 cannot be used against
symbol cti_vm_throw; recompile with -fPIC

and I'm insufficiently interested in chasing this.