CMake option REDUCE_LVGL_BINARY_SIZE should be available only under GNU builds

ValentiWorkLearning · ValentiWorkLearning · commit 01ed264a4001 · 2021-10-14T15:39:36.000+03:00
diff --git a/Firmware/graphics/lvgl_lib/lvgl_library/CMakeLists.txt b/Firmware/graphics/lvgl_lib/lvgl_library/CMakeLists.txt
@@ -360,6 +360,6 @@ if(REDUCE_LVGL_BINARY_SIZE)
     target_compile_options(
         ${TARGET_NAME}
         PUBLIC
-        -Os
+        $<$<CXX_COMPILER_ID:GNU>:-Os>
     )
 endif()
