[lld][MinGW] Remove --no-as-needed from ignored flags

In the post commit discussion of https://reviews.llvm.org/D116484 it was concluded that `--no-as-needed` should not be ignored. `--as-needed` stays ignored as it is already the default behaviour on COFF, which cannot be changed.

Author: zero9178

lld/MinGW/Options.td

@@ -154,7 +154,6 @@ def: F<"end-group">;
 def: Flag<["--"], "full-shutdown">;
 defm: EqNoHelp<"major-image-version">;
 defm: EqNoHelp<"minor-image-version">;
-def: F<"no-as-needed">;
 def: F<"no-undefined">;
 def: F<"pic-executable">;
 defm: EqNoHelp<"plugin">;