Merge bitcoin/bitcoin#22533: guix/build: Remove vestigial SKIPATTEST.TAG

9f01fed guix/build: Remove vestigial SKIPATTEST.TAG (Carl Dong)

Pull request description:

  No longer needed or referenced by anything. A relic from prior to the great hierarchy overhaul of #22182

ACKs for top commit:
  achow101:
    ACK 9f01fed
  fanquake:
    ACK 9f01fed

Tree-SHA512: a94cf63f0c5cb8dbacf1025b6c0e81b219c2a3c93b3cbcefc239ccde29e602ecd4b717b1d93dbe53cb791a5017236fb09823c034aec42b0c31894fc9e0ab8b21

Author: fanquake

contrib/guix/libexec/build.sh

@@ -227,7 +227,6 @@ GIT_ARCHIVE="${DIST_ARCHIVE_BASE}/${DISTNAME}.tar.gz"
 # Create the source tarball if not already there
 if [ ! -e "$GIT_ARCHIVE" ]; then
     mkdir -p "$(dirname "$GIT_ARCHIVE")"
-    touch "${DIST_ARCHIVE_BASE}"/SKIPATTEST.TAG
     git archive --prefix="${DISTNAME}/" --output="$GIT_ARCHIVE" HEAD
 fi