Fix ccache configuration issue because it was configured before CUDA
Fix ccache configuration issue because it was configured before CUDA

Ccache was configured before CUDA was setup. This caused the launch-nvcc
script to include an empty CUDA_NVCC_EXECUTABLE variable.

arrayfire/arrayfire,arrayfire/arrayfire,umar456/arrayfire,9prady9/arrayfire,9prady9/arrayfire,9prady9/arrayfire,umar456/arrayfire,9prady9/arrayfire,umar456/arrayfire,umar456/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire