migration: Fix duplicated included in meson.build

This is the commint with the merge error (not in the submited patch).

commit 52623f2
Author: Lukas Straub <lukasstraub2@web.de>
Date:   Thu Apr 20 11:48:35 2023 +0200

    ram-compress.c: Make target independent

    Make ram-compress.c target independent.

Fixes: 52623f2
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20230509170217.83246-1-quintela@redhat.com>

migration/meson.build

@@ -22,7 +22,6 @@ softmmu_ss.add(files(
   'migration.c',
   'multifd.c',
   'multifd-zlib.c',
-  'multifd-zlib.c',
   'ram-compress.c',
   'options.c',
   'postcopy-ram.c',