Delete commented-out test

No point in keeping this around. Running automated tests with various
build tags is good enough.

xxhash_amd64_test.go

diff --git a/xxhash_amd64_test.go b/xxhash_amd64_test.go
deleted file mode 100644
index b145094..0000000
--- a/xxhash_amd64_test.go
+++ /dev/null
@@ -1,41 +0,0 @@
-// +build !appengine
-// +build gc
-// +build !purego
-
-package xxhash
-
-// TODO(caleb): Fix and re-enable with any ideas I get from
-// https://groups.google.com/d/msg/golang-nuts/wb5I2tjrwoc/xCzk6uchBgAJ
-
-//func TestSum64ASM(t *testing.T) {
-//        for i := 0; i < 500; i++ {
-//                b := make([]byte, i)
-//                for j := range b {
-//                        b[j] = byte(j)
-//                }
-//                pureGo := sum64Go(b)
-//                asm := Sum64(b)
-//                if pureGo != asm {
-//                        t.Fatalf("[i=%d] pure go gave 0x%x; asm gave 0x%x", i, pureGo, asm)
-//                }
-//        }
-//}
-
-//func TestWriteBlocksASM(t *testing.T) {
-//        d0 := New().(*Digest)
-//        d1 := New().(*Digest)
-//        for i := 32; i < 500; i++ {
-//                b := make([]byte, i)
-//                for j := range b {
-//                        b[j] = byte(j)
-//                }
-//                pureGo := writeBlocksGo(d0, b)
-//                asm := writeBlocks(d1, b)
-//                if !reflect.DeepEqual(pureGo, asm) {
-//                        t.Fatalf("[i=%d] pure go gave %v; asm gave %v", i, pureGo, asm)
-//                }
-//                if !reflect.DeepEqual(d0, d1) {
-//                        t.Fatalf("[i=%d] pure go had state %v; asm had state %v", i, d0, d1)
-//                }
-//        }
-//}