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.