message: c_example.x: add error message on dlopen() failure
  Add human readable error message in case of failure to load shared
  library.
diff: @@ -29,8 +29,10 @@ int main(int argc, const char *argv[])
  int lcore_id;
  void * handle = dlopen("libpcm.so", RTLD_LAZY);
  - if(!handle)
  + if(!handle) {
  + printf("Abort: could not (dynamically) load shared library \n");
  return -1;
  + }
  PCM.pcm_c_build_core_event = (int (*)(uint8_t, const char *)) dlsym(handle, "pcm_c_build_core_event");
  PCM.pcm_c_init = (int (*)()) dlsym(handle, "pcm_c_init");
  