fcitx: remove the correct obsolete patch

pkgs/tools/inputmethods/fcitx/fcitx-ecm.patch

@@ -0,0 +1,25 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index fd54ad8..ebb33d0 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,8 +5,7 @@ project(fcitx)
+ set(version 4.2.9)
+ 
+ 
+-find_package(ECM 0.0.11 REQUIRED NO_MODULE)
+-set(CMAKE_MODULE_PATH "${ECM_MODULE_PATH}" "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
++set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
+ set(CMAKE_AUTOMOC_RELAXED_MODE TRUE)
+ 
+ set_property(GLOBAL PROPERTY "__FCITX_INTERNAL_BUILD" On)
+--- a/cmake/FindXKBCommon.cmake
++++ b/cmake/FindXKBCommon.cmake
+@@ -1,5 +1,5 @@
+ 
+-include(ECMFindModuleHelpersStub)
++include(ECMFindModuleHelpers)
+ 
+ ecm_find_package_version_check(XKBCommon)
+ 
+-- 
+2.8.0

pkgs/tools/inputmethods/fcitx/fcitx-qt5-ecm.patch

@@ -1,29 +0,0 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index b8e729a..ebd3603 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -5,9 +5,7 @@ project(fcitx-qt5)
- set(FcitxQt5_VERSION 1.0.0)
- set(REQUIRED_QT_VERSION 5.1.0)
- 
--find_package(ECM 1.4.0 REQUIRED NO_MODULE)
--
--set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
-+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
- 
- include(GNUInstallDirs)
- include(FeatureSummary)
-diff --git a/cmake/FindXKBCommon.cmake b/cmake/FindXKBCommon.cmake
-index a645584..de0007d 100644
---- a/cmake/FindXKBCommon.cmake
-+++ b/cmake/FindXKBCommon.cmake
-@@ -1,5 +1,5 @@
- 
--include(ECMFindModuleHelpersStub)
-+include(ECMFindModuleHelpers)
- 
- ecm_find_package_version_check(XKBCommon)
- 
--- 
-2.8.0
-

pkgs/tools/inputmethods/fcitx/fcitx-qt5.nix

@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, cmake, fcitx, pkgconfig, qtbase, extra-cmake-modules }:
+{ stdenv, lib, fetchurl, cmake, fcitx, pkgconfig, qtbase, kde5 }:
 
 stdenv.mkDerivation rec {
   name = "fcitx-qt5-${version}";
@@ -9,9 +9,19 @@ stdenv.mkDerivation rec {
     sha256 = "1pj1b04n8r4kl7jh1qdv0xshgzb3zrmizfa3g5h3yk589h191vwc";
   };
 
-  nativeBuildInputs = [ cmake extra-cmake-modules pkgconfig ];
+  # The following is to not have a dependency on kde5 so the plugin can be part of qt5LibsFun
+  postUnpack = ''
+    ${lib.concatMapStrings (f: ''
+      ln -s ${kde5.extra-cmake-modules}/share/ECM/modules/${f} $sourceRoot/cmake/
+    '')
+    [ "ECMFindModuleHelpers.cmake" "ECMGenerateHeaders.cmake"
+      "ECMPackageConfigHelpers.cmake" "ECMQueryQmake.cmake"
+      "ECMSetupVersion.cmake" "ECMVersionHeader.h.in" ]}
+  '';
 
-  buildInputs = [ fcitx qtbase ];
+  patches = [ ./fcitx-qt5-ecm.patch ];
+
+  buildInputs = [ cmake fcitx pkgconfig qtbase ];
 
   preInstall = ''
     substituteInPlace platforminputcontext/cmake_install.cmake \