Extract the TensorRT build as part of the version in the FindTensorRT.cmake

[ryanolson]

#define NV_TENSORRT_MAJOR 5 //!< TensorRT major version.
#define NV_TENSORRT_MINOR 0 //!< TensorRT minor version.
#define NV_TENSORRT_PATCH 0 //!< TensorRT patch version.
#define NV_TENSORRT_BUILD 10 //!< TensorRT build number

[ryanolson]

Completed and merged