sysfs: cleanup windows rename (#1584)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

internal/sysfs/unlink.go

@@ -8,7 +8,7 @@ import (
 	"github.com/tetratelabs/wazero/internal/platform"
 )
 
-func Unlink(name string) (errno syscall.Errno) {
+func unlink(name string) (errno syscall.Errno) {
 	err := syscall.Unlink(name)
 	if errno = platform.UnwrapOSError(err); errno == syscall.EPERM {
 		errno = syscall.EISDIR