kmail: drop unneeded patch

pkgs/applications/kde/kmail.nix

@@ -27,5 +27,4 @@ mkDerivation {
     kdepim-addons
   ];
   propagatedUserEnvPkgs = [ kdepim-runtime kwallet akonadi ];
-  patches = [ ./kmail.patch ];
 }

pkgs/applications/kde/kmail.patch

@@ -1,24 +0,0 @@
-diff --git a/agents/archivemailagent/CMakeLists.txt b/agents/archivemailagent/CMakeLists.txt
-index 48ed076..9c56896 100644
---- a/agents/archivemailagent/CMakeLists.txt
-+++ b/agents/archivemailagent/CMakeLists.txt
-@@ -22,6 +22,7 @@ ki18n_wrap_ui(libarchivemailagent_SRCS ui/archivemailwidget.ui )
- add_library(archivemailagent STATIC ${libarchivemailagent_SRCS})
- target_link_libraries(archivemailagent
-     KF5::MailCommon
-+    KF5::Libkdepim
-     KF5::I18n
-     KF5::Notifications
-     KF5::IconThemes
-diff --git a/agents/followupreminderagent/CMakeLists.txt b/agents/followupreminderagent/CMakeLists.txt
-index a56b730..83604cf 100644
---- a/agents/followupreminderagent/CMakeLists.txt
-+++ b/agents/followupreminderagent/CMakeLists.txt
-@@ -23,6 +23,7 @@ target_link_libraries(followupreminderagent
-     KF5::AkonadiMime
-     KF5::AkonadiAgentBase
-     KF5::DBusAddons
-+    KF5::FollowupReminder
-     KF5::XmlGui
-     KF5::KIOWidgets
-     KF5::Notifications