Support building on GNU/Hurd

GNU/Hurd systems don't have strlcpy.

Signed-off-by: Thomas Schwinge <tschwinge@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -458,6 +458,10 @@ ifeq ($(uname_S),AIX)
 	NO_STRLCPY = YesPlease
 	NEEDS_LIBICONV=YesPlease
 endif
+ifeq ($(uname_S),GNU)
+	# GNU/Hurd
+	NO_STRLCPY=YesPlease
+endif
 ifeq ($(uname_S),IRIX64)
 	NO_IPV6=YesPlease
 	NO_SETENV=YesPlease