Remove xml2cmp leftovers: Remove FlatXmlFilter_cpp.uno.xml from make files

(follow up for a9916dab)

Change-Id: I816c9dd797fbf49d300cd0442c87f343bd1308d4
Reviewed-on: https://gerrit.libreoffice.org/1336Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>

odk/examples/DevelopersGuide/OfficeDev/makefile.mk

@@ -92,7 +92,6 @@ FILTERDETECTION_FILES=\
 DESTFLATXMLCPP=$(DESTDIRDEVGUIDEEXAMPLES)$/OfficeDev$/FilterDevelopment$/FlatXmlFilter_cpp
 FLATXMLCPP_FILES=\
     $(DESTFLATXMLCPP)$/FlatXml.cxx \
-    $(DESTFLATXMLCPP)$/FlatXmlFilter_cpp.uno.xml \
     $(DESTFLATXMLCPP)$/Makefile \
     $(DESTFLATXMLCPP)$/FlatXmlFilter_cpp.xcu