[poppler] reconsideration about iconv() in cpp frontend

[suzuki toshiya]

Albert Astals Cid wrote:
>>> Sure, is there any system where sizeof(unsigned short) != 2 anyway?
>> Maybe people feel "such system is out of scope", but there were:
>> https://web.archive.org/web/20090408221917/http://www.zib.de/benger/hdf5/Dat
>> atypes.html according to the description for "size_t H5Tget_precision (hid_t
>> type)", there is a note saying
>> "For instance, a short on a Cray is 32 significant bits in an eight-byte
>> field."
> 
> Yeah we don't care about Cray :D

So, I attached a revised patch which replacing ustring as
std::basic_string<uint16_t>, and removing conditionalized
codes for the platform where (uint16_t != unsigned short).

How about this?

Regards,
mpsuzuki
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