iomelt: fix broken urls, reformat

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

@@ -1,17 +1,19 @@
-{ stdenv, lib, fetchurl }:
+{ fetchurl
+, lib
+, stdenv
+}:
 
 let version = "0.7";
 in stdenv.mkDerivation {
-  pname = "iomelt";
   inherit version;
+  pname = "iomelt";
   src = fetchurl {
-    url = "http://iomelt.com/s/iomelt-${version}.tar.gz";
+    url = "https://web.archive.org/web/20180816072405if_/http://iomelt.com/s/iomelt-${version}.tar.gz";
     sha256 = "1jhrdm5b7f1bcbrdwcc4yzg26790jxl4d2ndqiwd9brl2g5537im";
   };
 
   preBuild = ''
-    mkdir -p $out/bin
-    mkdir -p $out/share/man/man1
+    install -d $out/{bin,share/man/man1}
 
     substituteInPlace Makefile \
       --replace /usr $out
@@ -19,9 +21,9 @@ in stdenv.mkDerivation {
 
   meta = with lib; {
     description = "A simple yet effective way to benchmark disk IO in Linux systems";
-    homepage    = "http://www.iomelt.com";
-    maintainers = with maintainers; [ ];
+    homepage = "https://github.com/camposr/iomelt";
+    maintainers = with maintainers; [ raspher ];
     license = licenses.artistic2;
-    platforms   = platforms.linux;
+    platforms = platforms.linux;
   };
 }