XXX Remove me

This shouldn't be necessary as we should be getting the equeue_stub
symbol, with proper C naming (not C++ mangled) from equeue_stub.c, which
goes into build/events/tests/UNITTESTS/doubles/libmbed-stubs-events.a
which we are indeed linking with when building
lorawan-lorawan-stack-unittest

Author: Patater

connectivity/lorawan/tests/UNITTESTS/features/lorawan/lorawantimer/Test_LoRaWANTimer.cpp

@@ -20,6 +20,8 @@
 
 #include "equeue_stub.h"
 
+equeue_stub_def equeue_stub;
+
 using namespace events;
 
 class Test_LoRaWANTimer : public testing::Test {