Remove the lines from cmn_TW.UTF-8.in which cannot work at the moment.

See this bug https://sourceware.org/bugzilla/show_bug.cgi?id=22898

These lines don’t yet work because of a glibc bug, not because of
problems in the locale data. No matter what sorting rules one uses,
these characters cannot be sorted at all at the moment.

As soon as that bug is fixed, these lines should be added back to the
test file.

	* localedata/cmn_TW.UTF-8.in: Remove the lines which cannot
        be sorted correctly at the moment because of a bug.