TriBITS: CuSolver TPL still uses raw find_library call

[terwin]

Bug Report

@bartlettroscoe

Description

#11093 updated CUDA TPLs to use find_package(CUDATookit) rather than raw find_ commands, but cmake/TPLs/FindTPLCUSOLVER.cmake was excluded.

[bartlettroscoe]

CC: @trilinos/framework, @sebrowne

@terwin, what is the underlying driver for this request? PR #11093 was in response to a specific issue with a customer code (see #10954).

[terwin]

@bartlettroscoe, I encountered this while rebuilding our code (without rebuilding Trilinos) after the CUDA installation on our system was moved. The build failed due to a single hard-coded path in the Trilinos installation (in CUSOLVERConfig.cmake). Digging into the origin of that hard-coded path, I found that the cuSOLVER TPL was inconsistent with the other CUDA TPLs and traced it back to #11093. This seemed like an oversight in that PR.

[bartlettroscoe]

@terwin, if you are in position to give this a try, could you try updating cmake/TPLs/FindTPLCUSOLVER.cmake to replicate the changes made in those other modules?

[terwin]

@bartlettroscoe, sure. I'll submit a PR later today.

[sebrowne]

Thanks for doing the legwork on this @terwin and @bartlettroscoe !