Link against system-cxx-std-lib for GHC 9.4+ (#197)

* Link against system-cxx-std-lib for GHC 9.4+

* Drop OS checks for linking with stdc++ when GHC < 9.4

Author: jship

dear-imgui.cabal

@@ -179,8 +179,10 @@ library
     imgui/imgui_draw.cpp
     imgui/imgui_tables.cpp
     imgui/imgui_widgets.cpp
-  extra-libraries:
-    stdc++
+  if impl(ghc >= 9.4)
+    build-depends: system-cxx-std-lib
+  else
+    extra-libraries: stdc++
   include-dirs:
     imgui
   build-depends: