Silence "expression result unused" warnings in AssertVariableIsOfTypeMacro

At least clang 3.1 generates those warnings. Prepend (void) to avoid them,
like we have in AssertMacro.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/c9d44a75d48ed8a9b9275b95be1fadaa562f3826

Modified Files
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src/include/c.h |    8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

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