Add Unicode 9 Bidi test to known failures.

OldBidiTest#testUnicode9EmojisAreLtrNeutral verifies that we treat
Unicode 9 Emojis correctly with regards to Bidi text. This test will
pass once Unicode 9 data is merged with the ICU 58 release. In the
meantime, tolerate its failure.

Bug: 31516121
Test: ran OldBidiTest with vogar

(cherry picked from commit ebbf2ff4d71a179f20a7a542116bfcd5dca99296)

Change-Id: Ia125ade1f17b4ea6195d5ba0571443e1cec951b3
1 file changed