mdbx: add MDBX_DBG_DUMP for mdbx_setup_debug().

So, meta-pages and lck-section now will be included into a coredump.

mdbx.h

@@ -1567,6 +1567,7 @@ LIBMDBX_API MDBX_oom_func *mdbx_env_get_oomfunc(MDBX_env *env);
 #define MDBX_DBG_EXTRA 8
 #define MDBX_DBG_AUDIT 16
 #define MDBX_DBG_JITTER 32
+#define MDBX_DBG_DUMP 64
 
 typedef void MDBX_debug_func(int type, const char *function, int line,
                              const char *msg, va_list args);