Remove calls to std::die in new entry points

Author: PietroGhg

source/adapters/native_cpu/command_buffer.cpp

@@ -138,16 +138,12 @@ UR_APIEXPORT ur_result_t UR_APICALL urCommandBufferAppendMemBufferFillExp(
     ur_exp_command_buffer_handle_t, ur_mem_handle_t, const void *, size_t,
     size_t, size_t, uint32_t, const ur_exp_command_buffer_sync_point_t *,
     ur_exp_command_buffer_sync_point_t *) {
-  detail::ur::die("Experimental Command-buffer feature is not "
-                  "implemented for the NativeCPU adapter.");
   return UR_RESULT_ERROR_UNSUPPORTED_FEATURE;
 }
 
 UR_APIEXPORT ur_result_t UR_APICALL urCommandBufferAppendUSMFillExp(
     ur_exp_command_buffer_handle_t, void *, const void *, size_t, size_t,
     uint32_t, const ur_exp_command_buffer_sync_point_t *,
     ur_exp_command_buffer_sync_point_t *) {
-  detail::ur::die("Experimental Command-buffer feature is not "
-                  "implemented for the NativeCPU adapter.");
   return UR_RESULT_ERROR_UNSUPPORTED_FEATURE;
 }