bdf2psf: fix license, run pre/post hooks

pkgs/tools/misc/bdf2psf/default.nix

@@ -14,10 +14,16 @@ stdenv.mkDerivation rec {
   dontConfigure = true;
   dontBuild = true;
 
-  unpackPhase = "dpkg-deb -x $src .";
+  unpackPhase = ''
+    runHook preUnpack
+    dpkg-deb -x $src .
+    runHook postUnpack
+  '';
   installPhase = "
+    runHook preInstall
     substituteInPlace usr/bin/bdf2psf --replace /usr/bin/perl ${perl}/bin/perl
     mv usr $out
+    runHook postInstall
   ";
 
   meta = with lib; {
@@ -26,7 +32,7 @@ stdenv.mkDerivation rec {
     longDescription = ''
       Font converter to generate console fonts from BDF source fonts
     '';
-    license = licenses.gpl2;
+    license = licenses.gpl2Plus;
     maintainers = with maintainers; [ rnhmjoj vrthra ];
     platforms = platforms.unix;
   };