This streamlines the package definition nicely and bring benefits, such as
having the Elisp files scanned for potential /bin/ programs and patched,
compressing the info manual, being able to compile the autoload file, and
installing the byte compiled files to the correct location (under site-lisp/).
* gnu/packages/emacs-xyz.scm (emacs-forge)[build-system]: Switch from the
gnu-build-system to the emacs-build-system.
[arguments]: Remove the #:modules and #:imported-modules arguments. Delete
all the custom phases except the 'chdir-lisp one, and add a new
'build-info-manual phase.
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