digest: use github.com/minio/sha256-simd

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

vendor/github.com/minio/sha256-simd/test-architectures.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+set -e
+
+go tool dist list | while IFS=/ read os arch; do
+    echo "Checking $os/$arch..."
+    echo " normal"
+    GOARCH=$arch GOOS=$os go build -o /dev/null ./...
+    echo " noasm"
+    GOARCH=$arch GOOS=$os go build -tags noasm -o /dev/null ./...
+    echo " appengine"
+    GOARCH=$arch GOOS=$os go build -tags appengine -o /dev/null ./...
+    echo " noasm,appengine"
+    GOARCH=$arch GOOS=$os go build -tags 'appengine noasm' -o /dev/null ./...
+done