hw/xwin: Remove nounicodeclipboard option
Always use CF_UNICODETEXT clipboard format. Windows will automatically down-convert to CF_TEXT for clients which request that. This is subtly different in one way: if CF_TEXT is requested, we now post CF_UNICODETEXT and it is converted to CF_TEXT *in the locale of the requesting process*. Previously, we would convert to CF_TEXT *in our locale* and post that. It looks like the code in the !X_HAVE_UTF8_STRING case didn't actually work correctly, but fortunately that has never been true...
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