Temp directory for packagaging got created to system root if
OBJECTS_DIR was empty. Fixed it to use '.' instead in those cases.
Reviewed-by: Janne Koskinen
(cherry picked from commit 930db5826ff2c02d54f2851494000c5fab97da54)
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
