ignore-value: make header idempotent

[pspp] / ChangeLog

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+2010-10-15  Eric Blake  <eblake@redhat.com>
+
+       ignore-value: make header idempotent
+       * lib/ignore-value.h: Add double-inclusion guards.
+       Reported by Stefan Berger.
+
 2010-10-15  Jim Meyering  <meyering@redhat.com>
 
        GNUmakefile: handle "stable" target, not "major"