Merge #171784: spirv-llvm-translator: fix duplicate makeFlags merge

Fixes the eval on staging branch.

pkgs/development/compilers/spirv-llvm-translator/default.nix

···
 
   checkInputs = [ lit ];
 
-  makeFlags = [ "llvm-spirv" ];
-
   cmakeFlags = [
     "-DLLVM_INCLUDE_TESTS=ON"
     "-DLLVM_DIR=${llvm_11.dev}"