linuxPackages.cpupower: clean up

fixes the build on 17.09

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

@@ -7,29 +7,23 @@ stdenv.mkDerivation {
 
   buildInputs = [ coreutils pciutils gettext ];
 
-  configurePhase = ''
+  postPatch = ''
     cd tools/power/cpupower
     sed -i 's,/bin/true,${coreutils}/bin/true,' Makefile
     sed -i 's,/bin/pwd,${coreutils}/bin/pwd,' Makefile
     sed -i 's,/usr/bin/install,${coreutils}/bin/install,' Makefile
   '';
 
-  buildPhase = ''
-    make
-  '';
-
-  installPhase = ''
-    make \
-      bindir="$out/bin" \
-      sbindir="$out/sbin" \
-      mandir="$out/share/man" \
-      includedir="$out/include" \
-      libdir="$out/lib" \
-      localedir="$out/share/locale" \
-      docdir="$out/share/doc/cpupower" \
-      confdir="$out/etc" \
-      install install-man
-  '';
+  installFlags = [
+    "bindir=$(out)/bin"
+    "sbindir=$(out)/sbin"
+    "mandir=$(out)/share/man"
+    "includedir=$(out)/include"
+    "libdir=$(out)/lib"
+    "localedir=$(out)/share/locale"
+    "docdir=$(out)/share/doc/cpupower"
+    "confdir=$(out)/etc"
+  ];
 
   enableParallelBuilding = true;