guix/build: Remove vestigial SKIPATTEST.TAG

Author: dongcarl

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