[cmake, macos] Suppress warnings for unused private members (#2583)

Co-authored-by: crueter <crueter@eden-emu.dev>
Reviewed-on: #2583
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Co-authored-by: nyx <contact@innix.space>
Co-committed-by: nyx <contact@innix.space>

src/CMakeLists.txt

@@ -141,7 +141,7 @@ else()
         -Wno-missing-field-initializers
     )
 
-    if (CXX_CLANG OR CXX_ICC) # Clang or AppleClang
+    if (CXX_CLANG OR CXX_ICC OR CXX_APPLE) # Clang, AppleClang, or Intel C++
         if (NOT MSVC)
             add_compile_options(
                 -Werror=shadow-uncaptured-local