build: also exclude .data.rel.ro in $(cmd_obj_init_o)

.data.rel.ro really is merely a special case of .rodata: r/o data, but
with runtime relocations (not relevant to Xen), i.e. r/o only after
relocations were performed (by the dynamic loader).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/Rules.mk

@@ -263,7 +263,7 @@ quiet_cmd_obj_init_o = INIT_O  $@
 define cmd_obj_init_o
     $(OBJDUMP) -h $< | while read idx name sz rest; do \
         case "$$name" in \
-        .*.local) ;; \
+        .*.local|.data.rel.ro|.data.rel.ro.*) ;; \
         .text|.text.*|.data|.data.*|.bss|.bss.*) \
             test $$(echo $$sz | sed 's,00*,0,') != 0 || continue; \
             echo "Error: size of $<:$$name is 0x$$sz" >&2; \