Don't do the fibonacci test for OTF2 config

The OTF2 library is unstable for "lots " of pthreads, so don't
do the std::async fibonacci test with OTF2.

src/unit_tests/C++/CMakeLists.txt

@@ -37,7 +37,6 @@ set(example_programs
     apex_hpx_task_wrapper_direct_actions
     apex_hpx_annotated_functions
     apex_profiler_guids
-    apex_fibonacci_std_async
    )
     #apex_set_thread_cap
     #apex_setup_power_cap_throttling
@@ -52,6 +51,10 @@ if ((NOT PAPI_FOUND) AND (NOT OTF2_FOUND))
     set(example_programs "${example_programs};apex_pthread_flood")
 endif()
 
+if ((NOT OTF2_FOUND))
+    set(example_programs "${example_programs};apex_fibonacci_std_async")
+endif()
+
 # std::threads crash when linked statically. :(
 if (NOT BUILD_STATIC_EXECUTABLES)
   set(example_programs "${example_programs};apex_new_task;apex_task_wrapper")