Replace default_handlers value by a reference.

Author: pan-

features/frameworks/utest/source/utest_default_handlers.cpp

@@ -34,6 +34,7 @@ const handlers_t utest::v1::verbose_continue_handlers = {
     verbose_case_failure_handler
 };
 
+const handlers_t& utest::v1::default_handlers = greentea_abort_handlers;
 
 // --- SPECIAL HANDLERS ---
 static void test_failure_handler(const failure_t failure) {

features/frameworks/utest/utest/utest_default_handlers.h

@@ -185,7 +185,7 @@ namespace v1 {
     extern const handlers_t selftest_handlers;
 
     /// The greentea aborting handlers are the default
-    const handlers_t default_handlers = greentea_abort_handlers;
+    extern const handlers_t& default_handlers;
 
 }   // namespace v1
 }   // namespace utest