gbuild: remove error stubs for renamed/removed functions

Change-Id: If1d0d5294af87f2b780deadb21d12a6ee90dead6
filter: define filter_XcuResTarget_get_clean_target

Change-Id: I8f830790935a05a0413187b6e21002e0f2563adf
gbuild: fix gb_Extension_use_default_description

Passing a target local variable like $(LOCATION) to
gb_Extension_add_file does not result in an actual dependency on the file.

Change-Id: Ide77ab81f19877267056bf8e50d69c9cfedcda79
sysui: fix yet more cases of accidental OpenOffice.org XML rebranding

Change-Id: I9c6bbd0ae57b90f9fec570ec5dea5058625e0f8f