odk: remove PREDICTABLE_URLS from doxygen config

Change-Id: Id3125481c6871176c2fd58dee3696482df88e7d3
diff --git a/odk/docs/idl/Doxyfile b/odk/docs/idl/Doxyfile
index 5982d5e..008ec15 100644
--- a/odk/docs/idl/Doxyfile
+++ b/odk/docs/idl/Doxyfile
@@ -34,8 +34,6 @@ SHORT_NAMES = %
# hmm... not sure if we want the source files in the output?
#SHOW_USED_FILES = NO
#SHOW_FILES = NO
# make it possible to auto-generate links to all compounds and members
PREDICTABLE_URLS = YES

# ideally everything should be documented, but...
EXTRACT_ALL = YES