checksums.md5: make the new optimized code work with big endian CPUs
checksums.md5: make the new optimized code work with big endian CPUs

erg/factor,erg/factor,mcandre/factor,ceninan/factor,littledan/Factor,seckar/factor,littledan/Factor,cataska/factor,mcandre/factor,ceninan/factor,mcandre/factor,mcandre/factor,kingcons/factor,littledan/Factor,mcandre/factor,erg/factor,cataska/factor,seckar/factor,cataska/factor,mcandre/factor,erg/factor,erg/factor,cataska/factor,seckar/factor,kingcons/factor,kingcons/factor,erg/factor,ceninan/factor,mcandre/factor,kingcons/factor,ceninan/factor,erg/factor,littledan/Factor