[compiler-rt] Support default-True lit config options (follow up to #174522) (#174642) The option added in #174522 breaks simulator tests, since `set_default` overrides `False` values with the default. Since these options are either string or boolean, this patches set_default to override only un-set or empty string values (empty string is not truth-y and therefore would be overwritten by defaults currently, so this is NFCI)
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