We had a crash bug where a cached copy of a iconv convenience pointer
was used after being freed when loadparm asked for iconv to
reload. This could happen if a python module used a iconv based
function before loadparm was completed.

The fix is to ensure that any use of this pointer remains valid, by
reusing the pointer itself when it has already been initialised, but
filling in the child elements with the updated values.

midl also supports this:

struct {
	long l1;
	[string] wchar_t str[16];
	long l2;
};

Where the wire size of str is encoded like a length_is() header:
4-byte offset == 0;
4-byte array length;

The strings are zero terminated.

metze