I found this thread over the same subject.
indilib.org/forum/ccds-dslrs/5978-libraw-latest-for-cr3.html
, I hope this is not more trouble for you than it is worth to get it into the repos, and functioning with the OS to the masses. Perhaps I should attempt a compile and rename to librawcr3 on my own as to not put anyone elses builds at risk? I am sorry for not finding this thread in the beginning, my search skills aren't very good.