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r288341: Honor VMFORMATS and VMSIZE if set in release.conf. [1] r288345: In followup to r288341, ensure VMFORMATS and VMSIZE are not set to empty values, which would result in nonintuitive build errors. r288347: Append VMFORMATS and VMSIZE to RELEASE_RMAKEFLAGS only if WITH_VMIMAGES is set. PR: 203420 [1] Sponsored by: The FreeBSD Foundation