nixpkgs/elvish: ignore additonal variables in direlv

.config/nixpkgs/elvish/lib/direlv.elv

@@ -46,6 +46,8 @@ var ignore = [
   HOME
   HOST_PATH
   LD
+  LD_DYLD_PATH
+  MACOSX_DEPLOYMENT_TARGET
   NM
   OBJCOPY
   OBJDUMP
@@ -127,6 +129,8 @@ fn env-from-nix-flake {|state-file|
     if (eq $v[type] "exported") {
       if (str:has-prefix $key "NIX_") {
         continue
+      } elif (str:has-prefix $key "__") {
+        continue
       } elif (has-value $ignore $key) {
         continue
       } elif (has-value $extend $key) {