EdjeMessageStringSet* m = (EdjeMessageStringSet*) safemalloc( sizeof(Edje_Message_String_Set) + (count-1)*sizeof(char *) );
if (m == NULL) 
   croak("Failed to allocate memory in _new function\n");

##</code><code>##

typedef struct
{
   int count;
   char *str[1];  // may be fine with [] or even just char* str (no subscript at all)
} Edje_Message_String_Set;

##</code><code>##

typedef struct
{
   int count;
   char** string_array;
} Edje_Message_String_Set;