Use new style backquotes

Use new style backquotes

* sha1-el.el (sha1-F0, sha1-F1, sha1-F2, sha1-F3, sha1-S1) (sha1-S5,
sha1-S30, sha1-OP, sha1-add-to-H): Use new style backquotes.

* md5-el.el: Dto.

* md4.el (md4-make-step): Dto.

* hmac-def.el (define-hmac-function): Dto.

* hex-util.el (hex-char-to-num, hex-char-to-char): Dto.

* eword-encode.el (make-ew-rword, ew-rword-text) (ew-rword-charset,
ew-rword-encoding, ew-rword-type): Dto.