* Revert "Enable line join styles and miter limit. (#3777)"

This reverts commit 5403f65b.

* Revert "Revert "Update switches to use StringView." (#3784)"

This reverts commit 80f039ff.

* Revert "Initial integration of libtxt with Flutter alongside Blink. (#3771)"

This reverts commit c548c65b.

It controls whether the observatory and diagnostic server will
bind to the IPv6 loopback address rather than the IPv4.

Fixes https://github.com/flutter/flutter/issues/9813

* Roll FTL to 77f430179ddc1ad82e9ad3c056b708f583804151

This makes FTL compilable on Windows.

* fix license

The script keeps state in the objects representing the repository files,
and it also maintains a cache of licenses.  This state should be freshly
recreated for each component so data from previous components does not
leak through.

See https://github.com/flutter/flutter/issues/8106