Do not unconditionally import nvdisasm from CUDA_Compiler_jll

The symbol won't be available on platforms which don't support CUDA, causing the
warning

```
  1 dependency had output during precompilation:
┌ CUDATools
│  WARNING: Imported binding CUDA_Compiler_jll.nvdisasm was undeclared at import time during import to CUDATools.
└
```

Author: giordano

CUDATools/src/CUDATools.jl

@@ -23,7 +23,7 @@ using GPUCompiler
 using GPUCompiler: CompilerJob, methodinstance
 using LLVM
 
-using CUDA_Compiler_jll: nvdisasm
+using CUDA_Compiler_jll: CUDA_Compiler_jll
 
 import Preferences
 using Printf

CUDATools/src/reflection.jl

@@ -126,7 +126,7 @@ function disassemble_cubin(io::IO, cubin::Vector{Cchar}; raw::Bool)
         write(cubin_io, cubin)
         flush(cubin_io)
 
-        cmd = `$(nvdisasm()) --print-code --print-line-info $cubin_path`
+        cmd = `$(CUDA_Compiler_jll.nvdisasm()) --print-code --print-line-info $cubin_path`
         for line in readlines(cmd)
             if !raw
                 # nvdisasm output is pretty verbose;