hmac-md5.el (hmac-md5): Specify the 4th arg to `md5' as `binary'

hmac-md5.el (hmac-md5): Specify the 4th arg to `md5' as `binary'
	if possible.
hmac-def.el hmac-md5.el hmac-sha1.el hmac-util.el
md5-dl.el md5-el.el md5.el sha1-dl.el sha1-el.el sha1.el
comment update