Add new test files.

src/testdir/test_set.in

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+Tests for :set     vim: set ft=vim :
+
+STARTTEST
+:so small.vim
+:set wildignore=*.png,
+:set wildignore+=*.jpg
+:$put =&wildignore
+:/^Output goes here/+1,$w! test.out
+:qa!
+ENDTEST
+
+Output goes here

src/testdir/test_set.ok

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+*.png,*.jpg