sync with svn:ignore. see r56105 [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

.gitignore

@@ -126,7 +126,7 @@ y.tab.c
 /enc/*.def
 /enc/*.exp
 /enc/*.lib
-/enc/unicode/data
+/enc/unicode/data/9.0.0/*.txt
 
 # /enc/trans/
 /enc/trans/*.c