i386: improve alignment of CPU model listing

Since the addition of the -IBRS CPU model variants, the descriptions
shown by '-cpu help' are not well aligned, as several model names
overflow the space allowed. Right aligning the CPU model names is also
not attractive, because it obscures the common name prefixes of many
models. The CPU model name field needs to be 4 characters larger, and
be left aligned instead.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
Message-Id: <20180606165527.17365-2-berrange@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

target/i386/cpu.c

@@ -3380,7 +3380,7 @@ static void x86_cpu_list_entry(gpointer data, gpointer user_data)
         desc = cc->cpu_def->model_id;
     }
 
-    (*s->cpu_fprintf)(s->file, "x86 %16s  %-48s\n",
+    (*s->cpu_fprintf)(s->file, "x86 %-20s  %-48s\n",
                       name, desc);
     g_free(name);
 }