pre-commit: auto remove unneeded trailing whitespace from Makefiles (#378)

Cleaned up some whitespace in the Makefiles

Add building of "flex" files (.ll) to gbuild.

Port main/idlc to gbuild.

Patch by: me



git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1842861 13f79535-47bb-0310-9956-ffa450edef68