delete directory and files related to Unicode version 11.0.0

this completes and closes feature #15321 git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67174 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2019-03-06 03:19:10 +00:00 · 2019-03-06 03:19:10 +00:00 · f831ca6764
--- a/enc/unicode/11.0.0/casefold.h
+++ b/enc/unicode/11.0.0/casefold.h
--- a/enc/unicode/11.0.0/name2ctype.h
+++ b/enc/unicode/11.0.0/name2ctype.h