dump: do not compile dump.o for user-mode emulation

It is not needed, because the monitor is not included.

Cc: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Makefile.target

@@ -147,6 +147,7 @@ obj-y += memory.o savevm.o cputlb.o
 obj-y += memory_mapping.o
 obj-$(CONFIG_HAVE_GET_MEMORY_MAPPING) += arch_memory_mapping.o
 obj-$(CONFIG_HAVE_CORE_DUMP) += arch_dump.o
+obj-y += dump.o
 LIBS+=-lz
 
 QEMU_CFLAGS += $(VNC_TLS_CFLAGS)
@@ -196,8 +197,6 @@ obj-y += $(addprefix ../, $(trace-obj-y))
 
 endif # CONFIG_SOFTMMU
 
-obj-y += dump.o
-
 ifndef CONFIG_LINUX_USER
 ifndef CONFIG_BSD_USER
 # libcacard needs qemu-thread support, and besides is only needed by devices