kwin: remove obsolete patch

pkgs/desktops/plasma-5.4/kwin/libinput-0.8.patch

@@ -1,25 +0,0 @@
-commit a93a2ab1918630c6d571b5a24379c15a0458d1fa
-Author: Martin Gräßlin <mgraesslin@kde.org>
-Date:   Wed Jan 28 16:20:57 2015 +0100
-
-    Disable libinput integration if >= 0.8 is found
-    
-    libinput 0.8 is incompatible causing the build to fail. As we are in
-    dependency freeze the only option is to disable the build.
-    
-    BUG: 342893
-    FIXED-IN: 5.2.1
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 550ef57..8d9c593 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -145,7 +145,7 @@ set_package_properties(UDev PROPERTIES  URL "http://www.freedesktop.org/software
-                                         PURPOSE "Required for input handling on Wayland."
-                         )
- set(HAVE_INPUT FALSE)
--if (Libinput_FOUND AND UDEV_FOUND)
-+if (Libinput_FOUND AND UDEV_FOUND AND Libinput_VERSION VERSION_LESS 0.8)
-     set(HAVE_INPUT TRUE)
- endif()
-