gen.go: include core unicode generation

Include the generation of core Unicode tables in generation process.

Also ensure that vendored packages are up to date after the update.

Using this tool to update Core ensures that core, at least, will use a
consistent set of Unicode.

Change-Id: Ic7cca370b4af8556a79111f1b5ec2eb4381b5dc1
Reviewed-on: https://go-review.googlesource.com/29990
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed