gnu: Use emacs-no-x when we just want to byte-compile code.
* gnu/packages/code.scm (cflow)[native-inputs]: Change EMACS to
EMACS-NO-X.
* gnu/packages/databases.scm (recutils): Likewise.
* gnu/packages/emacs.scm (geiser, paredit, magit, emacs-w3m, emacs-wget,
emms, bbdb): Likewise.
* gnu/packages/idutils.scm (idutils): Likewise.
* gnu/packages/mail.scm (mu): Likewise.
* gnu/packages/package-management.scm (guix-0.8.1): Likewise.
* gnu/packages/scheme.scm (bigloo): Likewise.
* gnu/packages/version-control.scm (vc-dwim): Likewise.
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