ams: support building unit test programs on windows/linux/macos

libraries/libstratosphere/source/settings/impl/settings_serial_number_impl.cpp

@@ -19,13 +19,23 @@
 namespace ams::settings::impl {
 
     Result GetSerialNumber(settings::factory::SerialNumber *out) {
+        #if defined(ATMOSPHERE_OS_HORIZON)
         static_assert(sizeof(*out) == sizeof(::SetCalSerialNumber));
         return ::setcalGetSerialNumber(reinterpret_cast<::SetCalSerialNumber *>(out));
+        #else
+        AMS_UNUSED(out);
+        AMS_ABORT("TODO");
+        #endif
     }
 
     Result GetSerialNumber(settings::system::SerialNumber *out) {
+        #if defined(ATMOSPHERE_OS_HORIZON)
         static_assert(sizeof(*out) == sizeof(::SetSysSerialNumber));
         return ::setsysGetSerialNumber(reinterpret_cast<::SetSysSerialNumber *>(out));
+        #else
+        AMS_UNUSED(out);
+        AMS_ABORT("TODO");
+        #endif
     }
 
 }