gnu: Revert inputs from gtk+-3 to gtk+-2.

* gnu/packages/cdrom.scm (dvdisaster): Replace input gtk+ by gtk+-2.
* gnu/packages/emacs.scm (emacs): Replace input gtk+ by gtk+-2.
* gnu/packages/geeqie.scm (geeqie): Replace input gtk+ by gtk+-2.
* gnu/packages/gkrellm.scm (gkrellm): Replace input gtk+ by gtk+-2.
* gnu/packages/mp3.scm (ripperx): Replace input gtk+ by gtk+-2.
* gnu/packages/scheme.scm: Drop duplicate inclusion of module gtk.

gnu/packages/cdrom.scm

@@ -160,7 +160,7 @@ reconstruction capability.")
     (build-system gnu-build-system)
     (inputs
      `(("gettext" ,gnu:gettext)
-       ("gtk+" ,gtk+)
+       ("gtk+" ,gtk+-2)
        ("pkg-config" ,pkg-config)
        ("which" ,which)))
     (arguments

gnu/packages/emacs.scm

@@ -72,7 +72,7 @@
 
        ;; TODO: Add the optional dependencies.
        ("xlibs" ,libx11)
-       ("gtk+" ,gtk+)
+       ("gtk+" ,gtk+-2)
        ("libXft" ,libxft)
        ("libtiff" ,libtiff)
        ;; ("libungif" ,libungif)

gnu/packages/geeqie.scm

@@ -76,7 +76,7 @@ and XMP metadata of images in various formats.")
        ("lcms" ,lcms)
        ("exiv2" ,exiv2)
        ("libpng" ,libpng)
-       ("gtk+" ,gtk+)
+       ("gtk+" ,gtk+-2)
        ("pkg-config" ,pkg-config)))
     (home-page "http://geeqie.sourceforge.net")
     (synopsis "Lightweight GTK+ based image viewer")

gnu/packages/gkrellm.scm

@@ -43,7 +43,7 @@
     (build-system gnu-build-system)
     (inputs
      `(("gettext" ,gnu:gettext)
-       ("gtk+" ,gtk+)
+       ("gtk+" ,gtk+-2)
        ("libice" ,libice)
        ("libsm" ,libsm)))
     (native-inputs

gnu/packages/mp3.scm

@@ -250,7 +250,7 @@ use with CD-recording software).")
    (inputs
     `(("patch/libm" ,(search-patch "ripperx-libm.patch"))
       ("glib" ,glib)
-      ("gtk+" ,gtk+)
+      ("gtk+" ,gtk+-2)
       ("id3lib" ,id3lib)
       ("pkg-config" ,pkg-config)))
    (arguments

gnu/packages/scheme.scm

@@ -35,7 +35,6 @@
   #:use-module (gnu packages gtk)
   #:use-module (gnu packages libffi)
   #:use-module (gnu packages libjpeg)
-  #:use-module ((gnu packages gtk) #:select (cairo pango))
   #:use-module (ice-9 match))
 
 (define-public mit-scheme