rocmPackages.clr: add $out/lib to libamdhip64.so's rpath (#493411)

pkgs/development/rocm-modules/clr/default.nix

@@ -207,6 +207,14 @@ stdenv.mkDerivation (finalAttrs: {
     ln -s ${hipClang} $out/llvm
   '';
 
+  # libamdhip64.so dlopens its own bare name for hipGetProcAddress symbol resolution.
+  # Add its own directory to its RPATH so it can find itself
+  # Must be in postFixup so it runs after patchelf --shrink-rpath which removes
+  # the apparently useless rpath
+  postFixup = ''
+    patchelf --add-rpath "$out/lib" "$out/lib/libamdhip64.so"
+  '';
+
   disallowedRequisites = [
     gcc-unwrapped
   ];