Don't require `view' when compiling.

Don't require `view' when compiling.
(help-with-tutorial, describe-function, describe-function-1)
(variable-at-point, describe-variable, locate-library):
Functions moved into `help-funs.el'.
(help-manyarg-func-alist): Variable moved into `help-funs.el'.
(help-mode, help-mode-setup, help-mode-finish, help-button-action)
(help-setup-xref, help-xref-following, help-make-xrefs)
(help-xref-button, help-insert-xref-button, help-xref-interned)
(help-xref-go-back, help-go-back, help-do-xref, help-follow)
(help-xref-on-pp): Functions moved into `help-mode.el'
(help-mode-map, help-xref-stack, help-xref-stack-item)
(help-highlight-p, help-highlight-face, help-back-label)
(help-xref-symbol-regexp, help-xref-mule-regexp)
(help-xref-info-regexp): Variables moved into `help-mode.el'.
(help-symbol, help-back, help-info, help-customize-variable)
(help-function-def, help-variable-def):
Button-types moved into `help-mode.el'.
(load-symbol-file-load-history, symbol-file):
Functions moved into `subr.el'.
(symbol-file-load-history-loaded): Variable moved into `subr.el'.
(view-lossage): Call `help-setup-xref' instead of doing it manually.