t4211: add tests for -L with standard diff options

t4211: add tests for -L with standard diff options

Now that -L output flows through the standard diff pipeline, verify
that previously-ignored diff options work: formatting (--word-diff,
--word-diff-regex, --no-prefix, --src/dst-prefix, --full-index,
--abbrev), whitespace handling (-w, -b), output indicators
(--output-indicator-new/old/context), direction reversal (-R),
--color-moved, and pickaxe options (-S, -G).

Signed-off-by: Michael Montalbo <mmontalbo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>