Fix writing array/field name on big-endian machines
Fix writing array/field name on big-endian machines

As reported by https://github.com/tbeu/matio/issues/123

MaartenBent/matio,MaartenBent/matio,MaartenBent/matio,tbeu/matio,tbeu/matio,tbeu/matio,tbeu/matio,MaartenBent/matio