robin_hood: Update to version 3.11.3

The only difference with upstream is that we keep std::malloc() as
malloc() to avoid issues with gnulib that sometimes redefine malloc to
rpl_malloc with a macro without defining std::rpl_malloc.

* spot/priv/robin_hood.hh, debian/copyright: Update.
* spot/priv/Makefile.am (update): Rename std::malloc to malloc.

debian/copyright

@@ -201,7 +201,7 @@ License: Expat
  IN THE SOFTWARE.
 
 Files: spot/priv/robin_hood.hh
-Copyright: 2018-2019 Martin Ankerl
+Copyright: 2018-2021 Martin Ankerl
 License: Expat
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal

spot/priv/Makefile.am

@@ -1,6 +1,6 @@
 ## -*- coding: utf-8 -*-
-## Copyright (C) 2013-2019 Laboratoire de Recherche et Développement
-## de l'Epita (LRDE).
+## Copyright (C) 2013-2019, 2021 Laboratoire de Recherche et
+## Développement de l'Epita (LRDE).
 ##
 ## This file is part of Spot, a model checking library.
 ##
@@ -41,5 +41,6 @@ GH = https://raw.githubusercontent.com/martinus
 RH = $(GH)/robin-hood-hashing/master/src/include/robin_hood.h
 .PHONY: update
 update:
-	wget $(RH) -O $(srcdir)/robin_hood.hh || \
-	  curl $(RH) -o $(srcdir)/robin_hood.hh
+	wget $(RH) -O robin_hood.tmp || curl $(RH) -o robin_hood.tmp
+	sed 's/std::malloc/malloc/' robin_hood.tmp > $(srcdir)/robin_hood.hh
+	rm -f robin_hood.tmp