bird2: 2.0.2 -> 2.0.4

https://gitlab.labs.nic.cz/labs/bird/blob/v2.0.4/NEWS
The patch doesn't need so much context.

pkgs/servers/bird/default.nix

@@ -57,7 +57,7 @@ in
   };
 
   bird2 = generic {
-    version = "2.0.2";
-    sha256 = "03s8hcl761y3489j1krarm3r3iy5qid26508i91yvy38ypb92pq3";
+    version = "2.0.4";
+    sha256 = "1phl8ycasbzgla83d9zbzzy1ymjz30k1qh1pmywmjhbxa6vi0q37";
   };
 }

pkgs/servers/bird/dont-create-sysconfdir-2.patch

@@ -1,13 +1,6 @@
-diff --git a/Makefile.in b/Makefile.in
-index fdd5e6c..45f81a1 100644
 --- a/Makefile.in
 +++ b/Makefile.in
-@@ -165,7 +165,7 @@ tags:
- # Install
- 
+@@ -165,2 +165,2 @@
  install: all
--	$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir) $(DESTDIR)/@runtimedir@
+-	$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir) $(DESTDIR)/$(runstatedir)
 +	$(INSTALL) -d $(DESTDIR)/$(sbindir) $(DESTDIR)/$(sysconfdir)
- 	$(INSTALL_PROGRAM) $(exedir)/bird $(DESTDIR)/$(sbindir)/bird
- 	$(INSTALL_PROGRAM) $(exedir)/birdcl $(DESTDIR)/$(sbindir)/birdcl
- 	if test -n "@CLIENT@" ; then								\