Revert 9.5 pgindent changes to atomics directory files

Bruce Momjian <bruce@momjian.us>

Commit: befa3e648ce018d84cd2a0df701927c56fe3da4e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2015-05-25T01:45:01Z
Releases: 9.5.0
Revert 9.5 pgindent changes to atomics directory files

This is because there are many __asm__ blocks there that pgindent messes
up.  Also configure pgindent to skip that directory in the future.

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