This is to undo a mistake introduced in !69806 (merged), and to fix another issue that was present in the code for even longer.
${LWTNN_INCLUDE_DIRS}
also needs to be used.The reason I noticed these mistakes is because of the "serious warnings" in the latest nightlies.
https://bigpanda.cern.ch/nview/?nightly=main_Athena_x86_64-el9-gcc13-opt
Something that the shifters should've really picked up on...