Describe the bug
CuArrays does not find the dll for cudnn on windows 10. Enabling of debug information reveals that it looks for the following filenames:
Debug: Looking for library cudnn64, cudnn, cudnn64_10, cudnn64_102

However, the version of cuDNN which works with CUDA 10.2 is version 7.6 and the precompiled files downloadable from NVIDIAS homepage name the file cudnn64_7.dll.

To Reproduce
The Minimal Working Example (MWE) for this bug:

julia> using CuArrays

julia> CuArrays.has_cudnn()
false

Expected behavior
Find cudnn so that has_cudnn() returns true.

Build log

# Not applicable I guess...

Environment details (please complete this section)
Details on Julia:

julia> versioninfo()
Julia Version 1.3.1
Commit 2d5741174c (2019-12-30 21:36 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-6.0.1 (ORCJIT, haswell)
Environment:
  JULIA_DEPOT_PATH = E:/Programs/julia/.julia
  JULIA_NUM_THREADS = 6

Julia packages:

• CuArrays.jl:
• CUDAnative.jl:
• ...

CUDA: 10.2, cudnn 7.6.5

Additional context
Temporary workaround is to create a copy of cudnn64_7.dll which matches one of the tried names (well duh!).