highgui: fix Win32 with OPENGL=ON

Author: alalek

modules/highgui/CMakeLists.txt

@@ -271,6 +271,10 @@ if(APPLE)
   add_apple_compiler_options(${the_module})
 endif()
 
+if(OPENCV_HIGHGUI_BUILTIN_BACKEND STREQUAL "WIN32UI" AND HAVE_OPENGL AND OPENGL_LIBRARIES)
+  ocv_target_link_libraries(${the_module} PRIVATE "${OPENGL_LIBRARIES}")
+endif()
+
 if(MSVC AND NOT BUILD_SHARED_LIBS AND BUILD_WITH_STATIC_CRT)
   set_target_properties(${the_module} PROPERTIES LINK_FLAGS "/NODEFAULTLIB:atlthunk.lib /NODEFAULTLIB:atlsd.lib /NODEFAULTLIB:libcmt.lib /DEBUG")
 endif()