* guix/build/emacs-build-system.scm (set-emacs-load-path): Include Emacs Lisp
directories from all inputs. Also, add the unpacked source directory to
EMACSLOADPATH.
(emacs-inputs, emacs-inputs-directories, emacs-input->el-directory,
emacs-inputs-el-directories): Remove.
(%standard-phases): Move set-emacs-load-path phase to after unpack phase.
Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>