unicode/norm: remove empty test file
unicode/norm: remove empty test file

Change-Id: I7981eb364a6cea658e80fcc0e1aba042b5bc4718
Reviewed-on: https://go-review.googlesource.com/75430
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/text