Fix for GCC > 5.3 errors for CUDA backend
Fix for GCC > 5.3 errors for CUDA backend

merlin-ext/arrayfire,arrayfire/arrayfire,bkloppenborg/arrayfire,ghisvail/arrayfire,ghisvail/arrayfire,victorv/arrayfire,marbre/arrayfire,ghisvail/arrayfire,shehzan10/arrayfire,shehzan10/arrayfire,9prady9/arrayfire,bkloppenborg/arrayfire,marbre/arrayfire,shehzan10/arrayfire,ghisvail/arrayfire,9prady9/arrayfire,arrayfire/arrayfire,merlin-ext/arrayfire,bkloppenborg/arrayfire,munnybearz/arrayfire,munnybearz/arrayfire,shehzan10/arrayfire,merlin-ext/arrayfire,munnybearz/arrayfire,9prady9/arrayfire,merlin-ext/arrayfire,marbre/arrayfire,victorv/arrayfire,9prady9/arrayfire,marbre/arrayfire,umar456/arrayfire,arrayfire/arrayfire,umar456/arrayfire,victorv/arrayfire,bkloppenborg/arrayfire,victorv/arrayfire,arrayfire/arrayfire,umar456/arrayfire,umar456/arrayfire