Make ETW no-op on ARM

Proper support for ETW on ARM will require additional changes in Go to support
more than 16 bytes of arguments to a syscall callback. Until this work is done,
the ETW package is being changed to no-op on ARM.

pkg/etw/newprovider_unsupported.go

@@ -0,0 +1,12 @@
+// +build arm 386
+
+package etw
+
+import (
+	"github.com/Microsoft/go-winio/pkg/guid"
+)
+
+// NewProviderWithID returns a nil provider on unsupported platforms.
+func NewProviderWithID(name string, id *guid.GUID, callback EnableCallback) (provider *Provider, err error) {
+	return nil, nil
+}