kde/gear: apply suggestions from code review

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

pkgs/applications/kde/kaddressbook.nix

@@ -22,6 +22,7 @@ mkDerivation {
     kxmlgui libkdepim libkleo mailcommon pimcommon prison qgpgme qtbase
   ];
   postInstall = ''
+    # added as an include directory by cmake files and fails to compile if it's missing
     mkdir -p "$out/include/KF5"
   '';
 }

pkgs/development/libraries/mimetic/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
       url = "https://github.com/tat/mimetic/commit/bf84940f9021950c80846e6b1a5f8b0b55991b00.patch";
       sha256 = "sha256-1JW9zPg67BgNsdIjK/jp9j7QMg50eRMz5FsDsbbzBlI=";
     })
-  ] ++ lib.optional stdenv.isAarch64 [ ./narrowing.patch ];
+  ] ++ lib.optional stdenv.isAarch64 ./narrowing.patch;
 
   meta = with lib; {
     description = "MIME handling library";