Enable the Khronos SPIRV-LLVM-Translator (by default) instead of the
built-in translator, which is unsupported by upstream and broken.

Link: https://github.com/intel/intel-graphics-compiler/issues/345


Fixes: #2
Signed-off-by: Joan Bruguera Micó <joanbrugueram@gmail.com>

This now links to ldd directly.