Fix compilation of reference_counted_message_pool with ETL_LOG_ERROR enabled

[valentink-eroad]

The fix is for the following compilation errors that were reported when ETL_LOG_ERROR was enabled

etl/include/etl/reference_counted_message_pool.h:125:7: error: ‘etl::exception’ is an inaccessible base of ‘etl::reference_counted_message_pool_allocation_failure’
  125 |       ETL_ASSERT((p != ETL_NULLPTR), ETL_ERROR(etl::reference_counted_message_pool_allocation_failure));
      |       ^~~~~~~~~~
...
etl/reference_counted_message_pool.h:167:7: error: ‘etl::exception’ is an inaccessible base of ‘etl::reference_counted_message_pool_release_failure’
  167 |       ETL_ASSERT(released, ETL_ERROR(etl::reference_counted_message_pool_release_failure));
      |       ^~~~~~~~~~

Here is the content of our etl_profile.h:

#ifndef ETL_PROFILE_INCLUDED_
#define ETL_PROFILE_INCLUDED_

#include "etl/profiles/determine_compiler_language_support.h"
#include "etl/profiles/determine_compiler_version.h"
#include "etl/profiles/determine_development_os.h"

//*****************************************************************************
// Generic C++17
//*****************************************************************************
#ifdef UNITTEST
#define ETL_IN_UNIT_TEST

#define ETL_TARGET_OS_LINUX

#ifndef ETL_COMPILER_TYPE_DETECTED
#define ETL_COMPILER_GCC
#endif

#else /* ifdef UNITTEST */

#define ETL_TARGET_DEVICE_ARM

#define ETL_TARGET_OS_NONE

#ifndef ETL_COMPILER_TYPE_DETECTED
#define ETL_COMPILER_ARM7
#endif

#endif /* ifdef UNITTEST else */


#ifndef ETL_CPP17_SUPPORTED
#define ETL_CPP17_SUPPORTED 1
#endif

#ifdef ETL_CPP20_SUPPORTED
#undef ETL_CPP20_SUPPORTED
#endif
#define ETL_CPP20_SUPPORTED 0


/* ETL Error handling */
#define ETL_LOG_ERRORS 1
#define ETL_CHECK_PUSH_POP 1
#define ETL_VERBOSE_ERRORS 1

namespace etl {
    class exception;
};

/**
 * @brief ETL error handler
 *
 * The error handler only logs an error raised in ETL.
 * Note that many ETL methods use ETL_ASSERT macro that allows to continue
 * running the method code even if assert failed.
 *
 * @param e exception info from ETL
 */
void etl_err_handler(const etl::exception& e);

#endif /* #ifndef ETL_PROFILE_INCLUDED_ */

PS: fixed a couple of typos in etl_platform.h

[jwellbelove]

"The error handler only logs an error raised in ETL.
 * Note that many ETL methods use ETL_ASSERT macro that allows to continue
 * running the method code even if assert failed."

It is expected that your error handler will halt in the appropriate way for your platform.