Style fixes:  * Wrap long declarations to fit 80 chars  * #undef macros that shouldn't be exported  * Organize the version-dependent conditionals a    bit more consistently
Style fixes:
 * Wrap long declarations to fit 80 chars
 * #undef macros that shouldn't be exported
 * Organize the version-dependent conditionals a
   bit more consistently

Speculative:
 * libarchive 3.0 will (eventually) use int64_t
   instead of off_t.  This is an attempt to avoid
   some the headaches caused by Linux LFS.  (I'll
   still have to do ugly things for the struct stat
   references in archive_entry.h, of course.)

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