guix: Exclude minisketch files from release tarball

Author: luke-jr

contrib/guix/libexec/make_release_tarball.sh

@@ -16,6 +16,7 @@ DISTNAME="$2"
 
 git archive --prefix="${DISTNAME}/" HEAD |
  tar -xp \
+  --exclude '*minisketch*' \
  # end of tar options
 tar \
   --format=ustar \