gnu: mdk: Sort inputs alphabetically.

* gnu/packages/education.scm (mdk)[native-inputs]: Sort inputs
alphabetically.
[inputs]: Same.

gnu/packages/education.scm

@@ -970,15 +970,15 @@ floating through space.")
      `(#:configure-flags (list "--enable-gui=yes" "-with-readline=yes")))
     (native-inputs
      `(("flex" ,flex)
-       ("pkg-config" ,pkg-config)
-       ("intltool" ,intltool)))
+       ("intltool" ,intltool)
+       ("pkg-config" ,pkg-config)))
     (inputs
-     `(("readline" ,readline)
-       ("glib" ,glib)
+     `(("glib" ,glib)
        ("gtk+" ,gtk+)
+       ("libglade" ,libglade)
        ("ncurses" ,ncurses)
        ("pango" ,pango)
-       ("libglade" ,libglade)))
+       ("readline" ,readline)))
     (home-page "https://www.gnu.org/software/mdk/")
     (synopsis "Virtual development environment for Knuth's MIX")
     (description