fix TLF_HOME logic so it remains optional
fix TLF_HOME logic so it remains optional

adufilie/flex-sdk,danteinforno/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,apache/flex-sdk,danteinforno/flex-sdk,apache/flex-sdk,adufilie/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,apache/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,apache/flex-sdk,adufilie/flex-sdk,shyamalschandra/flex-sdk,adufilie/flex-sdk,danteinforno/flex-sdk,SlavaRa/flex-sdk,danteinforno/flex-sdk,adufilie/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,adufilie/flex-sdk,apache/flex-sdk,SlavaRa/flex-sdk,danteinforno/flex-sdk,shyamalschandra/flex-sdk,SlavaRa/flex-sdk,danteinforno/flex-sdk