Fix up Eshell 'require's after previous dependency reshuffle.

Fix up Eshell 'require's after previous dependency reshuffle.

* lisp/eshell/em-unix.el:
* lisp/eshell/em-script.el:
* lisp/eshell/em-pred.el:
* lisp/eshell/em-dirs.el:
* lisp/eshell/em-alias.el:
Fix up 'require's to silence byte-compiler.

* lisp/eshell/esh-util.el (eshell-read-hosts-file): Don't limit number
of entries per line.  Preserve the structure.
(eshell-read-hosts): Adjust accordingly.