cpufrequtils: add license + homepage

pkgs/os-specific/linux/cpufrequtils/default.nix

···
 
   buildInputs = [ stdenv.cc.libc.linuxHeaders libtool gettext ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Tools to display or change the CPU governor settings";
-    platforms = stdenv.lib.platforms.linux;
+    homepage = http://ftp.be.debian.org/pub/linux/utils/kernel/cpufreq/cpufrequtils.html;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
   };
 }