[committed] Define HAVE_sync_compare_and_swap* on hppa-linux

[John David Anglin]

The attached change enables future support using the kernel assisted  
atomic support.  It's a bit
of a fudge since the libcall routines are not lock free, but  
everything appears to work.

Tested on hppa-unknown-linux-gnu.  Committed to trunk.

Dave
--
John David Anglin	dave.anglin@bell.net



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