[m-rev.] diff: protect MR_thread_pinning properly

[Julien Fischer]

This fixes one of the problems pointed out by Sergey Khorev.

----

Branches: main, 10.04

runtime/mercury_wrapper.c:
 	Fix incorrect macros protecting code that uses
         MR_thread_pinning.

Julien.

Index: runtime/mercury_wrapper.c
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_wrapper.c,v
retrieving revision 1.211
diff -u -r1.211 mercury_wrapper.c
--- runtime/mercury_wrapper.c	1 Nov 2010 05:01:14 -0000	1.211
+++ runtime/mercury_wrapper.c	13 Nov 2010 17:03:15 -0000
@@ -1825,7 +1825,7 @@
                  break;

              case MR_THREAD_PINNING:
-#if defined(MR_THREAD_SAFE) && defined(MR_LL_PARALLEL_CONJ)
+#if defined(MR_LL_PARALLEL_CONJ) && defined(MR_HAVE_SCHED_SETAFFINITY)
                  MR_thread_pinning = MR_TRUE;
  #endif
                  break;
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