New way to build packages

Looks like xar command line is removed in 10.15.4 so we let pkgutil do the job for us.
pkgutil knows what to do and which compression needs to be used.

CloverPackage/package/buildpkg.sh

@@ -1591,10 +1591,9 @@ buildpackage ()
                 header+="\t\t<${script##*/} file=\"./${script##*/}\"/>\n"
             done
             header+="\t</scripts>\n"
-            # Create the Script archive file (cpio format)
-            (cd "${packagePath}/Scripts" && find . -print |                                    \
-                cpio -o -z -R root:wheel --format cpio > "${packagePath}/Temp/Scripts") 2>&1 | \
-                grep -vE '^[0-9]+\s+blocks?$' # to remove cpio stderr messages
+            # Copy Scripts with out compression as We are going to use pkgutil
+            # ..that will do it for Us .. and with the correct compression format :-)
+            cp -R "${packagePath}/Scripts" "${packagePath}/Temp/"
         fi
 
         header+="</pkg-info>"
@@ -1606,7 +1605,8 @@ buildpackage ()
             grep -vE '^[0-9]+\s+blocks?$' # to remove cpio stderr messages
 
         # Create the package
-        (cd "${packagePath}/Temp" && xar -c -f "${packagePath}/../${packageName}.pkg" --compression none .)
+        # (cd "${packagePath}/Temp" && xar -c -f "${packagePath}/../${packageName}.pkg" --compression none .)
+        (pkgutil --flatten "${packagePath}/Temp" "${packagePath}/../${packageName}.pkg")
 
         # Add the package to the list of build packages
         pkgrefs[${#pkgrefs[*]}]="\t<pkg-ref id=\"${packageRefId}\" installKBytes='${installedsize}' version='${CLOVER_VERSION}.0.0.${CLOVER_TIMESTAMP}'>#${packageName}.pkg</pkg-ref>"