Update to spice2x-25-04-25 (pre-apply)

> broken commit

external/imgui/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.12)
 project(imgui CXX)
 
 # dear imgui uses the C++ virtual interfaces for DirectX
@@ -8,6 +8,8 @@ set(IMGUI_HEADERS
         imconfig.h
         imgui.h
         imgui_internal.h
+        backends/imgui_impl_dx9.h
+        misc/cpp/imgui_stdlib.h
 )
 set(IMGUI_SOURCES
         imgui.cpp
@@ -15,6 +17,8 @@ set(IMGUI_SOURCES
         imgui_tables.cpp
         imgui_widgets.cpp
         imgui_demo.cpp
+        backends/imgui_impl_dx9.cpp
+        misc/cpp/imgui_stdlib.cpp
 )
 
 add_library(imgui STATIC ${IMGUI_HEADERS} ${IMGUI_SOURCES})