Description: Fix include statements to builds against system imgui
Forwarded: not-needed
--- a/code/lab/labv2_internal.h
+++ b/code/lab/labv2_internal.h
@@ -2,8 +2,8 @@
 #include "lab/manager/lab_manager.h"
 #include "imconfig.h"
 #include "imgui.h"
 #include "backends/imgui_impl_opengl3.h"
-#include "backends/imgui_impl_sdl.h"
-#include "extensions/imgui_sugar.hpp"
+#include "backends/imgui_impl_sdl2.h"
+#include "imgui_extensions/imgui_sugar.hpp"
 
 const std::unique_ptr<LabManager> &getLabManager();
--- a/code/lab/manager/lab_manager.cpp
+++ b/code/lab/manager/lab_manager.cpp
@@ -10,9 +10,9 @@
 #include "weapon/beam.h"
 
 #include "freespace.h"
 
-#include "extensions/ImGuizmo.h"
+#include "imgui_extensions/ImGuizmo.h"
 #include "io/mouse.h"
 #include "weapon/weapon.h"
 
 
--- a/code/osapi/osapi.cpp
+++ b/code/osapi/osapi.cpp
@@ -17,9 +17,9 @@
 #include <fcntl.h>
 #include <utf8.h>
 
 #include "imgui.h"
-#include "backends/imgui_impl_sdl.h"
+#include "backends/imgui_impl_sdl2.h"
 
 #ifdef SCP_UNIX
 #include <sys/stat.h>
 #elif defined(WIN32)
--- a/freespace2/SDLGraphicsOperations.cpp
+++ b/freespace2/SDLGraphicsOperations.cpp
@@ -6,9 +6,9 @@
 #include "cmdline/cmdline.h"
 
 #if SDL_VERSION_ATLEAST(2, 0, 6)
 #include <SDL_vulkan.h>
-#include "backends/imgui_impl_sdl.h"
+#include "backends/imgui_impl_sdl2.h"
 #include "backends/imgui_impl_opengl3.h"
 #endif
 
 namespace {