povray: do not use nobody/nogroup

Instead of patching the user to nobody, point HOME to TMPDIR, so the
configure script discovers the build user on its own.

pkgs/by-name/po/povray/package.nix

@@ -51,10 +51,9 @@ stdenv.mkDerivation (finalAttrs: {
     cd unix
     ./prebuild.sh
     cd ..
+    export HOME=$TMPDIR
     sed -i -e 's/^povconfuser.*/povconfuser=$(TMPDIR)\/povray/' Makefile.{am,in}
     sed -i -e 's/^povuser.*/povuser=$(TMPDIR)\/.povray/' Makefile.{am,in}
-    sed -i -e 's/^povowner.*/povowner=nobody/' Makefile.{am,in}
-    sed -i -e 's/^povgroup.*/povgroup=nogroup/' Makefile.{am,in}
   '';
 
   # https://github.com/POV-Ray/povray/issues/460