Add files missing from 7.4.408.

src/testdir/test_utf8.in

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+Tests for Unicode manipulations                vim: set ft=vim :
+ 
+STARTTEST
+:so small.vim
+:set encoding=utf-8
+:" Visual block Insert adjusts for multi-byte char
+:new
+:call setline(1, ["aaa", "あああ", "bbb"])
+:exe ":norm! gg0l\<C-V>jjIx\<Esc>"
+:let r = getline(1, '$')
+:
+:bwipeout!
+:$put=r
+:call garbagecollect(1)
+:/^start:/,$wq! test.out
+ENDTEST
+ 
+start:

src/testdir/test_utf8.ok

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+start:
+axaa
+xあああ
+bxbb