Example: Build and run also with static linking

[mmuetzel]

Statically linking requires that transitional dependencies are correctly described by the CMake targets.

Link executables in the example that are statically linked to the SuiteSparse libraries, and run them in the CI to check that.

That's not an extensive test. (Theoretically, we'd need to check if linking any combination of libraries works correctly.) But it's better than nothing.

This also revealed an issue when trying to link to a static library that was built with nvcc:

  [ 87%] Linking CXX executable my_demo_static
  /usr/bin/ld: /home/runner/work/SuiteSparse/SuiteSparse/lib/libgpuqrengine.a(GPUQREngine_UberKernel.cu.o): in function `__sti____cudaRegisterAll()':
  tmpxft_0000835f_00000000-6_GPUQREngine_UberKernel.compute_80.cudafe1.cpp:(.text.startup+0x21): undefined reference to `__cudaRegisterLinkedBinary_1763c3b7_25_GPUQREngine_UberKernel_cu_4549ffb9'
  collect2: error: ld returned 1 exit status

I think the relevant change was setting CUDA_RESOLVE_DEVICE_SYMBOLS to ON.