gnucash master: Update CMakeLists.txt for some cpp files that got missed when they were changed or added.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/bdf5cb9b (commit)
	from  https://github.com/Gnucash/gnucash/commit/56c33163 (commit)



commit bdf5cb9bee56de1a43402ba85b64fa5e1ba7f366
Author: John Ralls <jralls at ceridwen.us>
Date:   Sun Jul 5 14:13:02 2015 -0700

    Update CMakeLists.txt for some cpp files that got missed when they were changed or added.



Summary of changes:
 src/backend/xml/CMakeLists.txt | 2 +-
 src/engine/CMakeLists.txt      | 4 ++--
 src/libqof/CMakeLists.txt      | 6 +++++-
 3 files changed, 8 insertions(+), 4 deletions(-)