build(linux)!: remove legacy input option (#3562)

cmake/compile_definitions/linux.cmake

@@ -203,9 +203,6 @@ else()
     message(STATUS "Tray icon disabled")
 endif()
 
-if(${SUNSHINE_USE_LEGACY_INPUT})  # TODO: Remove this legacy option after the next stable release
-    list(APPEND PLATFORM_TARGET_FILES "${CMAKE_SOURCE_DIR}/src/platform/linux/input/legacy_input.cpp")
-else()
 # These need to be set before adding the inputtino subdirectory in order for them to be picked up
 set(LIBEVDEV_CUSTOM_INCLUDE_DIR "${EVDEV_INCLUDE_DIR}")
 set(LIBEVDEV_CUSTOM_LIBRARY "${EVDEV_LIBRARY}")
@@ -221,7 +218,6 @@ else()
 if(EXTERNAL_PROJECT_LIBEVDEV_USED)
     add_dependencies(libinputtino libevdev)
 endif()
-endif()
 
 # AppImage and Flatpak
 if (${SUNSHINE_BUILD_APPIMAGE})

cmake/prep/options.cmake

@@ -65,6 +65,4 @@ elseif(UNIX)  # Linux
             "Enable building wayland specific code." ON)
     option(SUNSHINE_ENABLE_X11
             "Enable X11 grab if available." ON)
-    option(SUNSHINE_USE_LEGACY_INPUT  # TODO: Remove this legacy option after the next stable release
-            "Use the legacy virtual input implementation." OFF)
 endif()