GUACAMOLE-2153: Fix GUAC_*_UTF16 on big-endian machine #618
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Since UTF-16 works with 16-bit values it has a byte order and that byte order is not well defined. There is a convention to use U+FEFF as first character which allows determining the endianess but it's commonly not present and doesn't seem to fit into the current code. The most common thing is to assume little-endian which is what I did here and is already implied by the test suite. If supporting both big- and little-endian UTF-16 is wanted one could create _UTF16LE and _UTF16BE variations of the functions.
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Since UTF-16 works with 16-bit values it has a byte order and that byte order is not well defined. There is a convention to use U+FEFF as first character which allows determining the endianess but it's commonly not present and doesn't seem to fit into the current code. The most common thing is to assume little-endian which is what I did here and is already implied by the test suite. If supporting both big- and little-endian UTF-16 is wanted one could create _UTF16LE and _UTF16BE variations of the functions.