Use #ifdef APPLE_MAC instead of #ifdef MAC to conditionalize Apple-specific behavior for unicode support in UDF so as not to conflict with the MAC Framework.
Use #ifdef APPLE_MAC instead of #ifdef MAC to conditionalize Apple-specific
behavior for unicode support in UDF so as not to conflict with the MAC
Framework.

Note that Apple's XNU kernel also uses #ifdef MAC for the MAC Framework.

Suggested by:	pjd
MFC after:	3 days

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