treewide: use less phases if not necessary

This removes some skipping of e.g. fixupPhase and cleans up occurences
where this led to duplicating code

pkgs/tools/text/popfile/default.nix

@@ -25,15 +25,12 @@ stdenv.mkDerivation rec {
     TimeDate # == DateParse
     HTMLTemplate
     # IO::Socket::Socks is not in nixpkgs
-    # IOSocketSocks 
+    # IOSocketSocks
     IOSocketSSL
     NetSSLeay
     SOAPLite
   ]);
 
-
-  phases = [ "unpackPhase" "installPhase" "patchPhase" "postInstall" ];
-
   installPhase = ''
     mkdir -p $out/bin
     # I user `cd` rather than `cp $out/* ...` b/c the * breaks syntax
@@ -42,11 +39,7 @@ stdenv.mkDerivation rec {
     cp -r * $out/bin
     cd $out/bin
     chmod +x *.pl
-  '';
 
-  patchPhase = "patchShebangs $out";
-
-  postInstall = ''
     find $out -name '*.pl' -executable | while read path; do
       wrapProgram "$path" \
         --prefix PERL5LIB : $PERL5LIB:$out/bin \
@@ -66,6 +59,4 @@ stdenv.mkDerivation rec {
     # http://getpopfile.org/docs/faq:systemrequirements
     platforms = stdenv.lib.platforms.linux;
   };
-
 }
-