It seems that the library has been designed for use includes in the form
"#include <dvdread/...>" while we used includes without the "dvdread/" prefix.
This caused that instead of using the standard path detected from pkg-config,
the expected path had to be added to to -I flag.
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 9f7c0362e2)