DolphinQt: Remove Steam runtime build support

Source/Core/DolphinQt/CMakeLists.txt

@@ -649,48 +649,6 @@ else()
   install(TARGETS dolphin-emu RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 endif()
 
-if (CMAKE_SYSTEM_NAME STREQUAL "Linux" AND STEAM)
-  # Set that we want ORIGIN in FLAGS.
-  # We also want RPATH, not RUNPATH, so disable the new tags.
-  target_link_options(dolphin-emu
-  PRIVATE
-    LINKER:-z,origin
-    LINKER:--disable-new-dtags
-  )
-
-  # For Steam Runtime builds, our Qt shared libraries will be in a "lib" folder.
-  set_target_properties(dolphin-emu PROPERTIES
-    BUILD_WITH_INSTALL_RPATH true
-    INSTALL_RPATH "\$ORIGIN/lib"
-  )
-
-  add_custom_command(TARGET dolphin-emu POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E make_directory "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/lib"
-    COMMAND cp "${Qt6_DIR}/../../LICENSE.*" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/lib"
-    COMMAND cp -P "${Qt6_DIR}/../../*.so*" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/lib"
-    COMMAND ${CMAKE_COMMAND} -E copy_directory "${Qt6_DIR}/../../../plugins" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/plugins"
-  )
-
-  # Copy qt.conf
-  target_sources(dolphin-emu PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/qt.conf")
-  add_custom_command(TARGET dolphin-emu POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_SOURCE_DIR}/qt.conf" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/qt.conf"
-  )
-
-  # Mark all data files as resources
-  set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS "${CMAKE_SOURCE_DIR}/Data/Sys")
-  file(GLOB_RECURSE resources RELATIVE "${CMAKE_SOURCE_DIR}/Data" "${CMAKE_SOURCE_DIR}/Data/Sys/*")
-  foreach(res ${resources})
-    target_sources(dolphin-emu PRIVATE "${CMAKE_SOURCE_DIR}/Data/${res}")
-    source_group("Resources" FILES "${CMAKE_SOURCE_DIR}/Data/${res}")
-  endforeach()
-
-  # Copy Sys folder
-  add_custom_command(TARGET dolphin-emu POST_BUILD
-    COMMAND ${CMAKE_COMMAND} -E copy_directory "${CMAKE_SOURCE_DIR}/Data/Sys" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/Sys"
-  )
-endif()
-
 if(USE_MGBA)
   target_sources(dolphin-emu PRIVATE
     GBAHost.cpp