gutenprint: remove gimp2Support since gimp2 is deprecated

The project sourgeforge page state clearly that the gimp plugin is
compatible with GIMP 2.x, so this has probably not been tested and
doesn't work since GIMP 3.x is alias to the `gimp` package.

This is part of #410814

pkgs/by-name/gu/gutenprint/package.nix

@@ -7,7 +7,6 @@
   pkg-config,
   ijs,
   zlib,
-  gimp2Support ? false,
   gimp,
   cupsSupport ? true,
   cups,
@@ -37,10 +36,6 @@ stdenv.mkDerivation (finalAttrs: {
     ijs
     zlib
   ]
-  ++ lib.optionals gimp2Support [
-    gimp.gtk
-    gimp
-  ]
   ++ lib.optionals cupsSupport [
     cups
     libusb1
@@ -53,19 +48,13 @@ stdenv.mkDerivation (finalAttrs: {
 
   # FIXME: hacky because we modify generated configure, but I haven't found a better way.
   # makeFlags doesn't change this everywhere (e.g. in cups-genppdupdate).
-  preConfigure =
-    lib.optionalString cupsSupport ''
-      sed -i \
-        -e "s,cups_conf_datadir=.*,cups_conf_datadir=\"$out/share/cups\",g" \
-        -e "s,cups_conf_serverbin=.*,cups_conf_serverbin=\"$out/lib/cups\",g" \
-        -e "s,cups_conf_serverroot=.*,cups_conf_serverroot=\"$out/etc/cups\",g" \
-        configure
-    ''
-    + lib.optionalString gimp2Support ''
-      sed -i \
-        -e "s,gimp2_plug_indir=.*,gimp2_plug_indir=\"$out/lib/gimp/${gimp.apiVersion}\",g" \
-        configure
-    '';
+  preConfigure = lib.optionalString cupsSupport ''
+    sed -i \
+      -e "s,cups_conf_datadir=.*,cups_conf_datadir=\"$out/share/cups\",g" \
+      -e "s,cups_conf_serverbin=.*,cups_conf_serverbin=\"$out/lib/cups\",g" \
+      -e "s,cups_conf_serverroot=.*,cups_conf_serverroot=\"$out/etc/cups\",g" \
+      configure
+  '';
 
   enableParallelBuilding = true;