Flush stdout to simplify for tools that buffer too heavily.

Tiny patch from Hugh Daschbach <hugh@ccss.com>.
Mark internal variable "g_utf8_skip" as static.

Reported by Thomas Dineen <tdineen@ix.netcom.com>.
Bump versions.
Update gnulib files.
Use libiconv 1.14.
Don't build csharp code when building Windows binaries.