gperf: bring back 3.0.4 to fix systemd build

Systemd has fixed this on master, but I don't want to meddle with the
patch that doesn't apply cleanly on our version.

pkgs/development/tools/misc/gperf/3.0.x.nix

@@ -0,0 +1,33 @@
+{stdenv, fetchurl}:
+
+stdenv.mkDerivation rec {
+  name = "gperf-3.0.4";
+
+  src = fetchurl {
+    url = "mirror://gnu/gperf/${name}.tar.gz";
+    sha256 = "0gnnm8iqcl52m8iha3sxrzrl9mcyhg7lfrhhqgdn4zj00ji14wbn";
+  };
+
+  meta = {
+    description = "Perfect hash function generator";
+
+    longDescription = ''
+      GNU gperf is a perfect hash function generator.  For a given
+      list of strings, it produces a hash function and hash table, in
+      form of C or C++ code, for looking up a value depending on the
+      input string.  The hash function is perfect, which means that
+      the hash table has no collisions, and the hash table lookup
+      needs a single string comparison only.
+
+      GNU gperf is highly customizable.  There are options for
+      generating C or C++ code, for emitting switch statements or
+      nested ifs instead of a hash table, and for tuning the algorithm
+      employed by gperf.
+    '';
+
+    license = stdenv.lib.licenses.gpl3Plus;
+
+    homepage = http://www.gnu.org/software/gperf/;
+    platforms = stdenv.lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -6354,6 +6354,7 @@ in
   gradle_2_5 = self.gradleGen.gradle_2_5;
 
   gperf = callPackage ../development/tools/misc/gperf { };
+  gperf_3_0 = callPackage ../development/tools/misc/gperf/3.0.x.nix { };
 
   grail = callPackage ../development/libraries/grail { };
 
@@ -11723,6 +11724,7 @@ in
 
   systemd = callPackage ../os-specific/linux/systemd {
     utillinux = utillinuxMinimal; # break the cyclic dependency
+    gperf = gperf_3_0; # fix build until v233
   }
     // {
       udev.bin = systemd;     # ${systemd.udev.bin}/bin/udevadm