PROBLEM: (94156) (PATCH ID: OSF540-032)
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  A recent patch to the linker (ld) introduced a regression where the
  linker no longer accepts /dev/null as a filename for the
  -update_registry flag.
  The error reported by the linker is:

        % cc -shared t.o -update_registry /dev/null
          ld:
          Cannot fflush, fseek, or ftruncate registry file /dev/null.

  This patch fixes the error, allowing the use of -update_registry /dev/null.