[sql] Fix missing files in reference version of SQLite 3.8.7.4.
test/capi3e.test had an encoding change from Latin1 to Unicode, which
requires a manual landing because it breaks patching.
ext/fts3/unicode/UnicodeData.txt was missing from the import for unknown
reasons. There are other .txt files in there, so it wasn't ignored, and
it was present in my client CLs. It is above 1MB, so landing manually.
BUG=340757
TBR=michaeln@chromium.org
Review URL: https://codereview.chromium.org/
864343004
Cr-Commit-Position: refs/heads/master@{#314207}