Link imgui against X11 libs

Imgui-docking >=v1.92.3 GLFW back-end requires linking against x11 libraries. This solves link failures when building tracy with the LEGACY option turned on.

Author: Lgt2x

cmake/vendor.cmake

@@ -162,6 +162,11 @@ target_link_libraries(TracyImGui PUBLIC TracyFreetype)
 target_compile_definitions(TracyImGui PRIVATE "IMGUI_ENABLE_FREETYPE")
 #target_compile_definitions(TracyImGui PUBLIC "IMGUI_DISABLE_OBSOLETE_FUNCTIONS")
 
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux" AND LEGACY)
+    find_package(X11 REQUIRED)
+    target_link_libraries(TracyImGui PUBLIC ${X11_LIBRARIES})
+endif()
+
 if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
     target_compile_definitions(TracyImGui PRIVATE "IMGUI_DISABLE_DEBUG_TOOLS" "IMGUI_DISABLE_DEMO_WINDOWS")
 endif()
@@ -294,4 +299,4 @@ if(NOT EMSCRIPTEN)
         target_include_directories(TracyLibcurl INTERFACE ${libcurl_SOURCE_DIR}/include)
     endif()
 
-endif()
+endif()