Try harder to find CUDA
Try harder to find CUDA

NVIDA installs CUDA in /usr/local/cuda-* wihthout setting up a link
to nvcc.  If nvcc is not in the path, search /usr/local for a CUDA
installation.

pycuda needs nvcc in the path and CUDA_ROOT set.  Also set LD_RUN_PATH
so that the proper shared libraries can be found at runtime without setting
LD_LIBRARY_PATH.

NervanaSystems/neon,Jokeren/neon,NervanaSystems/neon,Jokeren/neon,dongjoon-hyun/neon,DougFirErickson/neon,Bam4d/neon,nhynes/neon,dongjoon-hyun/neon,Bam4d/neon,DougFirErickson/neon,coufon/neon-distributed,coufon/neon-distributed,coufon/neon-distributed,dongjoon-hyun/neon,Bam4d/neon,nhynes/neon,Jokeren/neon,NervanaSystems/neon,nhynes/neon,Jokeren/neon,DougFirErickson/neon,NervanaSystems/neon