[notmuch] [PATCH] GCC3.5 fix

[Geo Carncross]

I have reason to need GCC 3.5 which doesn't process the unused(x) macro
correctly. This is probably a bug in 3.5, nevertheless the patch is
simple and corrects the build.

GCC 3.5 also does not understand -Wextra but Makefile is bound to change
less frequently, so I did not include a patch for that.

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