ErrNotSupportedPlatform is undefined define it

Signed-off-by: Harshavardhana <[email protected]>

Author: Harshavardhana

Diff for: xattr/errors.go

@@ -0,0 +1,8 @@
+package xattr
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var ErrNotSupportedPlatform = fmt.Errorf("platform and architecture is not supported %s %s", runtime.GOOS, runtime.GOARCH)