gnu: Move emacs for building from inputs to native-inputs.

* gnu/packages/emacs.scm (geiser): Move "emacs" from inputs to native-inputs.
(paredit): Likewise.
(haskell-mode): Likewise.
(emacs-w3m): Likewise.
(emacs-wget): Likewise.
* gnu/packages/mail.scm (mu): Likewise.
* gnu/packages/version-control.scm (vc-dwim): Likewise.

gnu/packages/emacs.scm

@@ -275,8 +275,8 @@ editor (without an X toolkit)" )
                                            "/share/emacs/site-lisp/"
                                            "geiser-autoloads.el")))
                  %standard-phases)))
-    (inputs `(("guile" ,guile-2.0)
-              ("emacs" ,emacs-no-x)))
+    (inputs `(("guile" ,guile-2.0)))
+    (native-inputs `(("emacs" ,emacs-no-x)))
     (home-page "http://nongnu.org/geiser/")
     (synopsis "Collection of Emacs modes for Guile and Racket hacking")
     (description
@@ -330,7 +330,7 @@ metadata.")
                (base32
                 "0pp3n8q6kc70blqsaw0zlzp6bc327dpgdrjr0cnh7hqg1lras7ka"))))
     (build-system trivial-build-system)
-    (inputs `(("emacs" ,emacs-no-x)))
+    (native-inputs `(("emacs" ,emacs-no-x)))
     (arguments
      `(#:modules ((guix build utils)
                   (guix build emacs-utils))
@@ -568,9 +568,9 @@ support for Git-SVN.")
                     version ".tar.gz"))
               (sha256
                (base32 "1kxc2yj8vb122dv91r68h7c5ladcryx963fr16plfhg71fv7f9av"))))
-    (inputs `(("emacs" ,emacs-no-x)))
     (native-inputs
-     `(("texinfo" ,texinfo)))
+     `(("emacs" ,emacs-no-x)
+       ("texinfo" ,texinfo)))
     (build-system gnu-build-system)
     (arguments
      `(#:make-flags (list (string-append "EMACS="
@@ -709,10 +709,10 @@ provides an optional IDE-like error list.")
               (base32
                "0zfxmq86pwk64yv0426gnjrvhjrgrjqn08sdcdhmmjmfpmqvm79y"))))
     (build-system gnu-build-system)
-    (native-inputs `(("autoconf" ,autoconf)))
-    (inputs `(("w3m" ,w3m)
-              ("imagemagick" ,imagemagick)
+    (native-inputs `(("autoconf" ,autoconf)
                      ("emacs" ,emacs-no-x)))
+    (inputs `(("w3m" ,w3m)
+              ("imagemagick" ,imagemagick)))
     (arguments
      `(#:modules ((guix build gnu-build-system)
                   (guix build utils)
@@ -781,8 +781,8 @@ provides an optional IDE-like error list.")
              (sha256
               (base32 "10byvyv9dk0ib55gfqm7bcpxmx2qbih1jd03gmihrppr2mn52nff"))))
     (build-system gnu-build-system)
-    (inputs `(("wget" ,wget)
-              ("emacs" ,emacs-no-x)))
+    (inputs `(("wget" ,wget)))
+    (native-inputs `(("emacs" ,emacs-no-x)))
     (arguments
      `(#:modules ((guix build gnu-build-system)
                   (guix build utils)

gnu/packages/mail.scm

@@ -344,12 +344,12 @@ repository and Maildir/IMAP as LOCAL repository.")
        ("glib" ,glib "bin")             ; for gtester
        ("autoconf" ,autoconf)
        ("automake" ,automake)
+       ("emacs" ,emacs-no-x)
        ("libtool" ,libtool)
        ("texinfo" ,texinfo)))
     ;; TODO: Add webkit and gtk to build the mug GUI.
     (inputs
      `(("xapian" ,xapian)
-       ("emacs" ,emacs-no-x)
        ("guile" ,guile-2.0)
        ("glib" ,glib)
        ("gmime" ,gmime)

gnu/packages/version-control.scm

@@ -851,8 +851,8 @@ masters from remote CVS hosts.")
                "094pjwshvazlgagc254in2xvrp93vhcj0kb5ms17qs7sch99x9z2"))))
     (build-system gnu-build-system)
     (inputs `(("perl" ,perl)
-              ("inetutils" ,inetutils)     ; for `hostname', used in the tests
-              ("emacs" ,emacs-no-x)))      ; for `ctags'
+              ("inetutils" ,inetutils))) ; for `hostname', used in the tests
+    (native-inputs `(("emacs" ,emacs-no-x))) ; for `ctags'
     (home-page "http://www.gnu.org/software/vc-dwim/")
     (synopsis "Version-control-agnostic ChangeLog diff and commit tool")
     (description