Replace CMAKE_CXX_COMPILER_FRONTEND_VARIANT check with MSVC variable

Telegram/CMakeLists.txt

@@ -1854,7 +1854,7 @@ endif()
 
 set_target_properties(Telegram PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${output_folder})
 
-if (WIN32 AND CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
+if (MSVC)
     target_link_libraries(Telegram
     PRIVATE
         delayimp
@@ -1951,7 +1951,7 @@ if (NOT DESKTOP_APP_DISABLE_AUTOUPDATE AND NOT build_macstore AND NOT build_wins
             base/platform/win/base_windows_safe_library.h
         )
         target_include_directories(Updater PRIVATE ${lib_base_loc})
-        if (CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC")
+        if (MSVC)
             target_link_libraries(Updater
             PRIVATE
                 delayimp