pre-commit auto remove trailing whitespace from `.mk` files (#377)

If there are too many changes / files I can create a smaller PR

Thanks

Also package the xml files for main/fileaccess and main/io.

Patch by: me



git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1772555 13f79535-47bb-0310-9956-ffa450edef68