[Dovecot] Apple patches 1-5

[Mike Abbott]

Here are the first few simple patches from Apple, based on dovecot-1.1.7. The comments with "APPLE" in them helped us merge in your new releases; feel free to remove them. Please let me know if you want subsequent patches in a different format, or if you have any questions.

Patch #1.  Some versions of Mac OS X have buggy CMSG_* macros.

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Patch #2.  Don't set "<username>=1" in the environment.

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Patch #3.  Some versions of Mac OS X return near-duplicate kevents.

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Patch #4. Null renames are actually pretty slow on HFS (Apple's file system), so avoid them.

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Patch #5.  Required by Apple's lawyers.

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