[m-rev.] diff: fix compilation error in runtime in .tr grades

[Julien Fischer]

Estimated hours taken: 0.1
Branches: main

runtime/mercury_trail.c:
 	Fix a bug that prevented the runtime from compiling in .tr grades.

Julien.

Index: runtime/mercury_trail.c
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_trail.c,v
retrieving revision 1.18
diff -u -r1.18 mercury_trail.c
--- runtime/mercury_trail.c	25 Sep 2008 08:24:15 -0000	1.18
+++ runtime/mercury_trail.c	26 Sep 2008 00:17:46 -0000
@@ -45,10 +45,8 @@
  MR_untrail_to(MR_TrailEntry *old_trail_ptr, MR_untrail_reason reason)
  {
      MR_TrailEntry   *tr_ptr;
-
-#if defined(MR_TRAIL_SEGMENTS)
      MR_TrailEntry   *tr_base;
-#endif
+
      /* Not needed, since MR_trail_ptr is never a real reg: */
      /* MR_restore_transient_registers(); */
      tr_ptr = MR_trail_ptr;
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