unicode/norm: allow tables to be dropped if not used

Not using init() does the trick.

It is not possible to only use some tables, but this is useful
in case a package provides normalization functionality as an
option.

Change-Id: I927db7d89910efa98393addb42d19266f6fe5496
Reviewed-on: https://go-review.googlesource.com/36511
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