vulkan: fix LD_LIBRARY_PATH on amdspv invocation
vulkan: fix LD_LIBRARY_PATH on amdspv invocation

RGA only provides a nude exec with a .so.
Because the packaging is not available on our platforms,
we need to manually add the directory to the library path.

Ryp/Reaper,Ryp/Reaper,Ryp/Reaper,Ryp/Reaper