pre-commit whitespace cleanup for `.component` files (#398)

Enforced 3 hooks for `.component` files:

- end-of-file-fixer
- mixed-line-ending
- trailing-whitespace

Port main/xmlhelp to gbuild.

Patch by: me



git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1838068 13f79535-47bb-0310-9956-ffa450edef68