dynlink_* was introduced since CUDA Toolkit 9.x but it's deprecated from 10.0.
Instead of using #ifdef hack, shipping nvidia headers of NVIDA CODEC SDK
can make build/code simple
Since cuda-tools 9.0, nvcuvid.h is replaced by dynlink_nvcuvid.h.
This patch changes nvdec to use run-time dynamic linking if
cuda-tools version >= 9.
nvenc does not require any change since its necessary headers are
still available.
https://bugzilla.gnome.org/show_bug.cgi?id=791724