use short names for doxygen-generated files

This is a build fix for Windows, otherwise packaging ODK fails with complaints
about lines in .ddf files being longer than 256 characters, caused by doxygen
using very long names for complex types (such as the rtl stringutils.hxx
helpers). It'd be possibly cleaner to avoid somehow generating docs for these
internal types at all, but this should do.

odk/pack/gendocu/Doxyfile

@@ -33,6 +33,7 @@ JAVADOC_AUTOBRIEF = YES
 
 EXTRACT_ALL = YES
 CASE_SENSE_NAMES = NO
+SHORT_NAMES = YES
 
 QUIET = %
 WARNINGS = YES