Change in coreboot[master]: arch/x86: include verstage.c only when verstage is a separate stage

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Change subject: arch/x86: include verstage.c only when verstage is a separate stage
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Patch Set 3:

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/28963/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/74861/ : SUCCESS