gdb: disable gdbserver for arc

Although gdb is supported, gdbserver is still not.

 checking whether gdbserver is supported on this host... no

Build breaks as gdbserver executable is not found during packaging.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

package/devel/gdb/Makefile

@@ -44,6 +44,7 @@ endef
 define Package/gdbserver
 $(call Package/gdb/Default)
   TITLE:=Remote server for GNU Debugger
+  DEPENDS=@!arc
 endef
 
 define Package/gdbserver/description