Move old multicol tests to a separate directory.

LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt

Index: LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
diff --git a/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt b/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
deleted file mode 100644
index b946cad305d9386ace969f9a88281b13686ec051..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/multicol/overflow-unsplittable-expected.txt
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