libarchive @3.3.1 fails to build on Snow Leopard (10.6.8)

[Richard L. Hamilton]

libarchive/archive_read_disk_entry_from_file.c:677: error: ‘ACL_SYNCHRONIZE’ undeclared here (not in a function)

What it boils down to is that the source is now using a symbol that was not defined in Snow Leopard (without checking for its availability).

Since it looks like it's making no decisions with that, but merely using it as part of a group of attributes to use when constructing a "trivial NFSv4 ACL from mode", some #ifdefs could probably work around it being present or absent.

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