Revise PARISC atomic support to use GCC atomic builtins

Revise PARISC atomic support to use GCC atomic builtins

Bug-Debian: http://bugs.debian.org/741190
Forwarded: not-needed
Last-Update: <2014-05-03>

 The current atomic support for PARISC uses a four word object
 to dynamically address the alignment requirements of the ldcw
 instruction.  Unfortunately, the current implementation breaks
 the smokeqt package build <http://bugs.debian.org/708200>.
 This change uses the GCC atomic builtin support available on
 linux for qt4-x11 atomic operations.  It is derived from the
 AVR32 implementation.  This allows atomic operations on integer
 objects.

Gbp-Pq: Name parisc-atomic.patch