lseek: avoid bash 3.2 broken pipe bug

[pspp] / ChangeLog

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 2010-02-22  Eric Blake  <eblake@redhat.com>
 
+       lseek: avoid bash 3.2 broken pipe bug
+       * m4/lseek.m4 (gl_FUNC_LSEEK): Drain pipe, to avoid spurious
+       warning from bash 3.2.
+       Reported by Ben Pfaff, with analysis from Bruno Haible.
+
        bootstrap: support non-FSF copyright holder
        * build-aux/bootstrap (COPYRIGHT_HOLDER, with_gettext): Allow
        bootstrap.conf override of COPYRIGHT_HOLDER.