daeed90f "re-base on ALv2 code" had incorporated
from <http://svn.apache.org/viewvc?view=revision&revision=1172102> "imported
patch extensions_i117681.patch" the parts using BAK_EXTENSIONS in
desktop/source/deployment/manager/, but not the parts setting BAK_EXTENSIONS in
scp2/source/ooo/.

Also, setting the stamp for "bak" in PackageManagerImpl::create needed to be
adapted to bee742eb "Fix sense of r/o detection
code, and clean up" and 61eeb689 "fix smoketest
- need to check read-only-ness of non-existent paths."

Change-Id: If7cc363b3cf21fd13fb467f5f672eda5312515c8