pgsql: Revert 9.5 pgindent changes to atomics directory files

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.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/befa3e648ce018d84cd2a0df701927c56fe3da4e

Modified Files
--------------
src/include/port/atomics/arch-ia64.h      |    6 +-
src/include/port/atomics/arch-x86.h       |  131 ++++++++++++++---------------
src/include/port/atomics/fallback.h       |   25 +++---
src/include/port/atomics/generic-acc.h    |   45 +++++-----
src/include/port/atomics/generic-gcc.h    |   49 +++++------
src/include/port/atomics/generic-msvc.h   |   25 +++---
src/include/port/atomics/generic-sunpro.h |   31 ++++---
src/include/port/atomics/generic-xlc.h    |   35 ++++----
src/include/port/atomics/generic.h        |   52 +++++-------
src/tools/pgindent/exclude_file_patterns  |    1 +
10 files changed, 182 insertions(+), 218 deletions(-)