Put the correct Unicode version number 11.0.0 into the generated files

Put the correct Unicode version number 11.0.0 into the generated files

In some places there was still the old Unicode version 10.0.0 in the files.

	* localedata/charmaps/UTF-8: Use correct Unicode version 11.0.0 in comment.
	* localedata/locales/i18n_ctype: Use correct Unicode version in comments
	and headers.
	* localedata/unicode-gen/utf8_gen.py: Add option to specify Unicode version
	* localedata/unicode-gen/Makefile: Use option to specify Unicode version
	for utf8_gen.py