fixincludeguards: fix include guards

Change-Id: Ie6e8d4272b0b1d0d2ce93bcbc2e818a9eac1a56b
Reviewed-on: https://gerrit.libreoffice.org/9629
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>