MDEV-26568 RPM logic prohibiting server major upgrade no longer works as expected

prevent %{VERSION} in the shell command to be expanded by rpmbuild

support-files/rpm/server-prein.sh

@@ -4,8 +4,8 @@
 installed=`rpm -q --whatprovides mysql-server 2> /dev/null`
 if [ $? -eq 0 -a -n "$installed" ]; then
   installed=`echo "$installed"|sed -n 1p`
-  vendor=`rpm -q --queryformat='%{VENDOR}' "$installed" 2>&1 | sed 's/Monty Program AB/MariaDB Foundation/'`
-  version=`rpm -q --queryformat='%{VERSION}' "$installed" 2>&1`
+  vendor=`rpm -q --queryformat='%''{VENDOR}' "$installed" 2>&1 | sed 's/Monty Program AB/MariaDB Foundation/'`
+  version=`rpm -q --queryformat='%''{VERSION}' "$installed" 2>&1`
   myvendor='%{mysql_vendor}'
   myversion='%{mysqlversion}'