added include dir to dependency copys to get h files (#580)

<!-- Thanks for the contribution, this is awesome. -->

Added a copy command from the dependency container to the final
container for /usr/local/include/ which ensures the header files get
copied to the final container.

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Dockerfile

@@ -40,6 +40,7 @@ RUN ./library.sh
 RUN ldconfig
 
 COPY --from=dependencies /usr/local/plugins/ /usr/local/plugins/
+COPY --from=dependencies /usr/local/include/ /usr/local/include/
 COPY --from=dependencies /usr/local/lib/ /usr/local/lib/
 COPY --from=dependencies /usr/local/bin/ /usr/local/bin/
 COPY --from=dependencies /usr/lib/ /usr/lib/