mdbx: add mdbx_assert_fail() to public API.

mdbx.h

@@ -1004,6 +1004,10 @@ LIBMDBX_API const char *mdbx_dump_val(const MDBX_val *key, char *const buf,
 /** \brief Panics with message and causes abnormal process termination. */
 LIBMDBX_API void mdbx_panic(const char *fmt, ...) MDBX_PRINTF_ARGS(1, 2);
 
+/** \brief Panics with asserton failed message and causes abnormal process
+ * termination. */
+LIBMDBX_API void mdbx_assert_fail(const MDBX_env *env, const char *msg,
+                                  const char *func, unsigned line);
 /** end of c_debug @} */
 
 /** \brief Environment flags