secure/precis: replace bytes.Compare with bytes.Equal
secure/precis: replace bytes.Compare with bytes.Equal

Change-Id: Ifa6ba05253b38e1cb3d5791e62b36a523fb68e52
GitHub-Last-Rev: 2d7de01c3d93285224e3c65f55845a316da8f4d0
GitHub-Pull-Request: golang/text#36
Reviewed-on: https://go-review.googlesource.com/c/text/+/438559
Run-TryBot: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Auto-Submit: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>
Auto-Submit: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

golang/text